11 meter antenna height The topic starter is 11m / cb yagis. 5: 75. Africa 3-12 2-11 2-12 1-12 2-11 S. 5: 20 (66) 7. 21-Nov-06: More NVIS: Horizontal Heights. A 160 meter dipole at that height is only one-eighth wavelength above the ground. To optimize the antenna for a frequency RANGE, do the calculations twice, Updated 6. 4 (21) 7. That, or a half wave dipole hung vertically from a tree or pole. Similar threads. Automotive The Antron 99 is a powerful antenna for 10-12 meter bands. 0 – 7. On 40m this antenna still manages an SWR of 1. To boost performance, you can use any standard antenna with these radios. Vertical Antenna Height: 17. Your mileage may vary. 000 to 29. 2-Element 11 Meter Antenna: The diagram below contains all the information you would need to build a 2-Element 11 Meter antenna. corresponds to 0. 5:1 across the whole band is not met if the antenna is erected at 80 feet. 7 % / 47. 5 Element Yagi (11) 8 Element Yagi (9) Cardioids (12) NVIS (3) MultiBanders (8) Arrays (11) This antenna is very light (8 lbs) so most TV antenna rotors can work in conjunction with the V-Quad. 6: 77. 1; 2; Next. For example, for 40m (7. Moved Permanently. Share. Like all other antennas designed for HamSphere 4. Most antennas are vertical on 11 meters, so a quarter wave whip over a large metal plane would be pretty good. e. Electrically the antennas can be fed with one To overcome this loss, it would be advantageous to be able to lower the antenna to increase the angle of radiation at higher frequencies — a remote-controlled variable-height tower. The higher you get it the better, as in just about ANY antenna installation, but keep in mind when going from a flat-top dipole to a 90° Inverted V, you're losing 3dB in the broadside direction to pick up performance in the perpendicular directions. Get Expert Help and Assistance. Series matched 20 and 15 meter dipoles at any height meet the 1. Parts: I get my antenna hardware from Craig K1QX of Radioware. For the lower bands, As the antenna height increases, so does the resonant frequency. from people who have hands-on knowledge. 6 ft. YOUR antenna height is 'best' when it is as high as you can manage and still stay As a general rule, most antennas should be at about half the wavelength of the transmitting frequency depending on the type and resonance frequency of the antenna. Solarcon MAX OPTIMIZER The Ultimate Optimizable 10-11 Meter Base Station Antenna 5000 Watt Rated New IMAX 2000 Upgrade. 1 to 0. S. The Inverted-Vee tends to be more omni-directional and radiate equally in all directions. 6: 21 (69) 5. The MFJ-1890 is a lightweight aluminum antenna designed to operate in the 10 meter band and we had hoped that with a little messing around we could get it to tune to the 11 meter cb band. , on 21 MHz) by lowering the antenna from its full 30m/98ft height to 20m/66ft height. 4 % dimensions for various Ham frequencies in the HF bands. , 13. What about antenna height and space required for rotating. But A beam type of antenna at a height of 70 feet or more will provide greatly superior performance over the same antenna at 35 feet, all other factors being equal. (The wavelength of the CB band is 11 meters which converts to 36 feet). 10/11 Meter Maximum Beam. Go. 5 or < Weight (lbs) 14; Stacking Kit: MBSK; Can be used Vertical or Horizontal; M00-05100. The table below tabulates the results. 54. 5m lengths (ca. By the The 3 element mono-band Yagis are by far the most cost effective beam antennas with good gain and excellent radiation patterns. married with two childrens, love Married at First Sight; The Real Housewives of Dallas; My 600-lb Life; Coax dipole antenna for 11 meters - advice needed . Amateur Vertical Antenna Calculator This basic calculator is designed to give the aproximate length If we drop the 20 meter antenna to 20 feet above ground, we not only lose over 2. If we specifically calculate for the 50 Ohm point, we discover that, at a height of 16. To calculate your height in centimeters from inches, multiply your height figure by 2. What's the 'best' height for a beam, or any antenna as far as that goes? The tower you have is perfect for 11 meters. 4") in total length, which comes to about 17 feet, 4. Vertical Antenna Mount Type: Mast mount . 11 Leave us a question or comment on Facebook . Antenna height should be 1/2 wave or better. Apr 7, 2018 #1 The best MINIMUM antenna height is one wavelength above rf ground. Premium Subscriber. This formula to obtain the length of a half-wave dipole antenna will give a good ballpark value to start with. The SWR chart on the right show the General Coverage antenna's SWR performance, within the 11 Meter band. SKU: 8010030 Category: HF Antennas. 975 MHz; 20 ft. A height of 120 feet or even For transmitting antennas, it's best to get at least 1 wavelength off the ground. Leaving it up permanently might There are many variations of the dipole antenna. 700 MHz, covering many channels. My recommendation for a maximum height for an NVIS antenna is about 0. T59P 1 1-1/2” . Reactions: spongella, Mophead, sunwave and 1 other person. When the antenna is finally placed at height, there will only be a small decrease in F/B ratio. Like 1 Dislike : glenn north lincs New Member. , 14. to 40 ft. 225, etc Divided by Freq MHz Percent smaller for the Inverted Vee Shooting skip is technically illegal on 11 meters, but the FCC doesn't enforce it (that I've ever heard). 24 Feet (Height) IMAX2000 Technical Specifications; Length 24ft Power Handling 5000 Watts; Solarcon IMAX2000 Reviews Probably the best know antenna on our 11 meter band ! Everyone When we come to a height of 15 meters we reach the same thing the angles C and D are A vertical (half wave) almost sitting at the ground IS capable of working DX! ( better then any horizontal antenna at that height! ) But placing a half wave vertical much higher However, this does not include any adjustment for the shape, wire size or insulation, height above ground, etc. 9: 25-0. If you’re mounting your antenna on a metal roof, mount it on a mast at least one meter. 8 (29) 7. SIZE LENGTH DESCRIPTION CHECKLIST . Wind Surface Area: 1. from california central valley. In this picture, the 40 Meter loading coil is in place. Citizens Total Height : 10,85 m Antenna Weight : 6,8 Kg. 7: 26-0. heavy duty mast. John_S Member. 4. 1: 161. It won't hurt to go higher. It's an Imax 2000 with ground plane, added ground plane wires for 15 and 12. I knew that a total height of 3 meters was workable, even though it did hit quite a number of overhead obstructions. These antennas heights from Figure 13 can be translated into any frequency where NVIS antenna performance is needed. A quarter wave at 27 MHz is close to 8 feet 8 inches. The following chart shows the 16. sunwave Member. Volumes of work have been written on dip Antenna height is important, but I wouldn't call it critical by any means. Dual-segment car walkie-talkie antenna; 36 feet aluminum tubular & telescopic antenna mast military Electro mechanical telescopic mast; Aluminium telescopic antenna mast towers motorised; 36 feet tubular antenna mast manufacture at best price in ne Telescopic mast 10mtr; Telescopic manual mast; Heavy Duty Telescopic Column Near Vertical Incidence Skywave (NVIS) is already pretty well defined in both radius and antenna height by definition. g. View MAXOPTIMIZER. G-Max is the first and only vertical antenna in the world for the bands of 10 or 11m in a collinear Building and experimenting with antennas can be an interesting part of the radio hobby. But the decrease is small and not worth trying to tune at height. 20: 11: 1. height. 25 wavelengths on 14 MHz). 2 MHz) operation, heights of 0. Another thing Rotators the good the bad and the ugly?. we are talking 4-5k miles on a veryical at less than 20 feet of the ground!! i think one of the best verticals on the Of course the best optimization is a single band antenna (11 meter) For 11 meters, vertically polarized is your best bet. Joined Jan 18, 2023 Messages 368 Location The antenna itself is 3. My vertical is 11 meters above ground, flat terrain, and working the world on 15 - 10 meters with it. Once the antenna is mounted it may seem big but it is actually one of the smallest 11 meter beam antennas on the market and it takes up considerably less space than a comparable 3 element Yagi antenna. Get The Card, Get The Gear, Get On The Air. D. 1 of 2 Go to page. For the groundwave, gaining 1 S point needs an doubling of your antenna height. 37 inches (1 meter) above the airport elevation for every 109. So there you have it. 850: 126' 6'' 253' 0'' 543' 3'' 38. MACO M103C . 800: 130' 0'' 260' 0'' 558' 4'' 39. 200, 144. The diagram below contains all the information you would need to build a 3-Element 11 Meter antenna. I use this design for my 40m A standard dipole generates a horizontal ratiation pattern in the shape of a figure 8, with maximum radiation broadside to the antenna. 75 The results are conveniently displayed in inches, centimeters, feet and meters. The chart below presents theoretical antenna gain versus antenna centre height above ground level and shows that there is 4. The corona loops on the super mag are round, diamond on the penetrator. PACKING LIST . The super mag won't stretch to 12 meter, the penetrator will, where the notion of . 5' to the feed point. Uncle P likes this post. Saturday at 11:19 AM. , 4 times) over a simple low dipole are possible • Consider horizontal loop or Lazy H over a Free Shipping - Cushcraft AR10 10 Meter Ringo Vertical Antennas with qualifying orders of $99. dxForums. Radiator and radials are of 5. Hams with these towers have reported up to 12 dB “DX-gain” (e. Think we had a discussion going on about : antenna feedpoint heigth, antenna current heigth and antenna top heigthetc. ground mounted vertical antenna, no height but a lot of ground wires. Here are the results from an EZNEC simulation of a simple 20 meter dipole resonance above average ground at three different heights: 8 ft. most shown power limited are a result of the connectors onlymost of our antennas can be made to handle 20kw++ call or read more Cubical quad antenna calculator in java script let you calculate elements size and spacing in inch and meters. ) At this height, overhead gain is down about 1 dB from the maximum. if it resonates too low, then it is too long, and vice versa. I have attached the manual below. For purposes of this blog, we will focus on a half-wave center-fed dipole with 50-ohm coax as the feedline. But, that's a 'minimum' recommended height. Vertical Antenna Height: 18. A General Coverage frequency (27. 2. It isn't going to help you out much with receivers 1000-2000km away. The larger the wire, the wider the bandwidth. 5:1 SWR goal across the band, with the plot on 15 11-meter Yagi 5-element at 80 ft (11m) above ground, while 80m version is at 165 ft (50m) and 60/40/30m versions are deployed at 132 ft (40m) heights. com. 5 (41) When we looked at the effect of antenna height for a dipole antenna, the antenna had a specific height. The Wire Size can range from 16 AWG to 12 AWG. 64 wave comes in. This antenna is illegal for 11 Meters use. Low antenna height. Reactions: merlin. That said, if at some point an "inspection" by FCC was to ever occur your "10 meter" antenna is in The gainmaster is great at 10 & 11 meters but I want to start on the 15, 17, 20 and 40 meter bands so I'll put this up and if it compares well on 10 & 11 meters as well, the GM will go. 050 This antenna is designed for mounting on a l-1/2” O. Top. 1: 165. Here we have collected some links to building instructions for 11m antennas on the Internet. Differences in ground elevation between your antenna and the airport runway may complicate this formula. If your height is in feet and inches, multiply the feet figure by 12 first, before adding on the extra inches and multiplying by 2. 2: 1. For best results with this type of antenna, the Apex Angle should be kept between 70 and 110 Degrees. The main thing with 11 meter (CB) radios is the height of the antenna and obstructions, more than what type of antenna Well, the difference between 16 and 17 feet is huge when it comes to tuning a half-wave antenna for 11 meter. . gov The FCC has enforced the antenna rules from time to time. 25dB increase in maximum gain by lifting the antenna from 2m to 9m image 1112×566 11. 8 (19) 12 (39) 8. 2 inches (17' 4. Antenna Power Rating: 500 W . there are differences of course. Citizens Band (CB) Service | FCC. Mount using U-bolts, saddles and hardware as shown in detail 2B. 200, 7. 16 wavelengths height has good gain. 0, the 5-el Yagis also feature low SWR across all bands, high radiation efficiency and excellent value for money. The antenna achieves best performance no more than 1/4 wavelength above the ground, and typically reaches receivers 50km-650km (30-400 miles) away. I am in the market to build a new 11 meter antenna for primary channel 27. 680 sq. Citizens Band Related. the instructions actually state 19 feet and 22 feet overall on the same instruction sheet:blink:, (HYGAIN is covering their azzes about metal antennas and CB users). ft. 13: 30: 1. For 75m (3. When all was said and done, my shortly I hope to errect my own butterfly quad which I will be using mainly on ten metres I note that the optimum height for 11 metres is about 36 feet (10. NVIS Antenna Strategy • Portable and field antennas will be less efficient due to space, height and setup time • “Command post” or “Net Control” antenna should be as efficient as possible • Gains of up to 6 dB (i. This eBay listing shows the Cushcraft AR-10 as including 11 Meters but that may or may not be accurate from the manufacturer. The document has moved here. In choosing between the J-Pole or the Slim Jim antenna the antenna height and your average terrain will play a large latitude, longitude, and height if you don’t already know it), antenna radiation center above mean * The GMRS antenna is close enough to the 11 meter antenna that it may alter the 11 meters performance, depending upon where the antenna (and the mast below it) is located relative to the top of the 11 meter antenna. The antenna height restriction for the US Amatuer Radio operator is 200 feet (unless living next to an airport runway system). 5 KW handling and be sure the coil will be a flashbulb at that power. 900: 123' 2'' 246' 4'' 528' 11'' 37. As far as height goes, there's an ancient antenna proverb: "Height is Might" (range gets better the higher it is, assuming a good quality of coax). An Optimum Height for an Elevated HF Antenna 1Notes appear on page 38. Antenna Power Rating: 1,000 W . 3 wavelengths. There are two ways to think about antenna and propagation prob-lems in linear media: in transmit mode and in receive mode. 6: 79. 5', Turn Radius: 10 Wind Survival (mph) 90; Tuning (Meters) 10-11; VSWR (adjustable) 1. Stick with the antenna tuner for the ICOM rig or put up a dedicated 10 Meter antenna. 365mhz. 2 mHz with a wavelength of 34. 050MHz; 35 ft. , have highest gain. Locked post. Thread starter Robb; Start date Jan 18, 2012; Robb Honorary #11 Wrench said: NOTICE: The Midwest 6 Meter DX Group will be set up at Hamvention in XeniaBOOTHS 9107-9111COME SAY HELLO! +1. 200 MHz; MFJ-1890 10 Meter Moxon Antenna (Tested on 10 meters & 11 meters/CB Band) MFJ MOXON Quick Look From CBRADIOMAGAZINE. the old P-500 were about 22' 9" start with 22 . 8 KB. Saturday at 11:13 AM @ BJ radionut: 28 days to HAMVENTION +1. The Penetrator boast 1. 60 ft. Also, please note this blog is only a starting point of discussion and is not intended to be the defining article on antenna height. that is correct, I just assembled one last week. Since the traditional formulas for the length of a with the right angle at the bottom. 7 % wavelength, with a length of 47. Next, Two Meters is line of sight. The feed-point is at the joint connection between radiator and radial system. Asia 2-14 1-12 2-14 3-14 4-11 Table 1: Midwest signal arrival angles That is about as high as most of us will ever deploy an antenna. 8 MHz) operation , a height of 40 ft. To overcome this loss, it would be advantageous to be able to lower the antenna to increase the angle of radiation at higher frequencies — a remote-controlled variable-height tower. Let's look at an example 3 Element/ 11 Meter Base Antenna "Maximum Beam", Gain: 11(db) Adjustable Gamma Match 2000 watts; Boom Length: 11. Even at low heights, the antenna maintains a low radiation angle, ideal for DX communications and short/medium distances. Re: Full wave loop for 11m. If you wish to use a center frequency above or below Antenna height also affects your takeoff angle (the elevation angle at which maximum RF energy is radiated). However, the most commonly bought and used base antennas As such I was thinking on improving my 11 meter antenna situation by adding something as simple as an inexpensive directional such as a Maco BA-1 and attach it horizantally to the mast just below the A99 and point it in their direction. 5 (25) 12. From the article: This is not the ideal DX antenna, but it does provide 11 13 63. Next Last. 5 a quarter wave would be 9 foot 0. Dimensions for 20m 2-element 200 ohm delta loop antenna 40m dimensions. However, as pointed out it is not enforced. Best compromise antenna I've put up that would do 11m locally and decent UK/Europe ham was a simple inverted L with remote base tuner. Delta (3 sides): 12' 5" per side, about 10' 9" in height for vertical. 574' feet for 160-15 meters (10 meters also, 11-Nov-06: Another 3 hours spent cutting more limbs and branches I didn't see near the end of the previous day. J. John Saunders | 05/22/2024. The best omni-directional base station antenna is currently the Solarcon Imax 2000 due it's improved dB gain and 24' height. Antenna Mount Operation: Isotron Antennas : Manual 20-11-10 modified 3. Yesterday at 1:19 PM. (same height) apart from some DX Antenna Length Chart in Feet and Meters Ham Band: Frequency (Mhz) 1/4 λ (Feet) 1/2 λ Dipole (Feet) 1 λ Loop (Feet) 1/4 λ (Meters) 1/2 λ Dipole (Meters) 1 λ Loop (Meters) 160: 1. So, for 80m this would be 24 m (80 feet: conveniently, in Imperial units the maximum height in feet is equal to the wavelength in meters. Today at 3:29 pm by Roadshome » New call sign request please (Issued) and what to look for and what to stay well clear of. 2 feet, this would be a mounting height of around 6 feet, which is pretty darn low. 30ft is nothing regarding long communication range on ground wave. The SPT-500 is also technically illegal for use on 11 meter because it extends more than 20 feet above the mounting structure. To Optimize for 11 meter performance assemble the antenna with the 12” optimizer section installed between the mid and top section as a 4 piece antenna. 2: 2. 4 inches (34', 8. Status Not open for further replies. According to the manual, 28. » Moxon for 11 meters Today at 3:41 pm by MM0IMC » Crt9900 just purchased advice please. Sqr (4 sides): 9' 4" per side, about 13' 2" diagonal Hex (6 sides): 6' 2. Connect the antenna to your transceiver by means of a suitable length of coax. 02. The 10 inch diameter sounds about right The commercial half wave version uses the base mounting to provide capacitance across the ring ( radiator is in a insulator inside the base mounting tube ,the length of tube inside the other affects the match , a bit like a gamma match rod) I found the design to be very fussy , the match changed dramatically with height The highest point of your antenna must not exceed 39. This is to ensure the antenna radiation pattern behaves as expected and doesn't get distorted. On DX This fantastic true full-size 5/8 Wave 10 / 12 Meter vertical antenna from Hy-Gain was a legend in the 70’s . Call Sign: 26-CT-4177 Posts Where the 2el yagi is situated at just 3 meters in your example. 5 : 1 or better across the 7. You will also need to hear the receiver from the antenna location. Full-wave 11 meter band (CB Radio Band) dipole antenna measuring approximately 34 feet, 8. With its high gain and tuning rings makes it 10-12 meters: Antenna Height: 17 feet: Construction: White Fiberglass: Mounting: U-bolt: Coax The Antron 99 is known for its Higher frequency band versions are at 20m above the surface of ground whereas the 160m band version of this antenna is hoisted to 40m height. This two-element Cubical Quad antenna is designed for use on either the 10-meter ham band or the 11-meter Citizen's Band. Central UK "Where shoes were made" Most parts are available on the World Wide Web or at some larger hardware stores. Gut mine 7 years ago The BIG SIGNAL DL-11 Delta Loop antenna, specifically designed for the 11-meter band, is an innovative and unique design that stands out in the market by allowing quick installation with a minimum mast height of 5 meters. 75 but why not a full 2 wave antenna a. What this article does do is provide a truly optimized 4 element Yagi design for the 11 meter “freeband” DX operator. the Moonraker GAP-H 1/2 Wave Base Vertical Antenna are crafted from durable aluminum and designed to cover the 10 meter ham band and most of the 11 meter CB band (Citizens Band) within the 26-30 MHz frequency range. 0. Last edited by simon26OD004 on 11 Mar 2011, an 11 meter end fed wire would be 36 foot 3. You may use an on-the-air pseudonym ("handle") of your choosing. 42 meters or 11 feet 2 inches long from the top of the mounting spring to the tip. If you don’t know exactly where the transmission towers are located, go check where I am going to guess it is a Cushcraft AR-10 for 10 Meters. (looks fancier) A series matched 40 meter antenna at either 80 or 35 feet meets the 2:1 SWR bandwidth objective, but the goal of SWR at or below 1. Share My bil gave me a cb antenna to try to turn down to a 10 meter antenna I would rather a 2 Both are 5/8 when tuned to 11 meters. . The measurements below are for building a simple Dipole Antenna. 1 MHz) is selected as this provides the best coverage of the 11 Meter band. 3 wavelengths, corresponding to heights of 13. Search or Browse Our Site. Joined Jul 1 along with possibly a 10' piece of mast to get the A99 a reasonable height above ground, a very now i got a sirio 2008 up and swr is very low on 11 meter ,and like 1:6 to 1 on 10 meters. 5 killowatts. 2, 144. More like 300 watts for both. It is made from high quality 16 AWG This will give your antenna more height. i have talked to people as far as south america and the dominican republic and puerto rico. Handles 1. This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen. This is to ensure the Vertical antennas have low elevation angles while horizontal dipoles and yagi antennas have low to high elevation angles depending on their height (measured in The thing ishorizontal antennas bennefit from a thing called "ground gain" in a better way then vertical antennas doat leastwhen they are at a sufficient height above Antenna Length Chart in Feet and Meters Ham Band: Frequency (Mhz) 1/4 λ (Feet) 1/2 λ Dipole (Feet) 1 λ Loop (Feet) 1/4 λ (Meters) 1/2 λ Dipole (Meters) 1 λ Loop (Meters) 160: For an 11 meter dipole designed for 27. These antennas have been deployed at heights of 95 feet (28m) above ground level. 5 dBi of gain, we’ve got a classic cloud burner, This chart summarizes the dimensions and target height for dipoole antennas. 36 yards (100 meters, 1 hectometer) of distance from the nearest point of the nearest airport runway. now it’s back to prove its legendary status once again! SPT-500 is specifically designed to accept AM-FM-SSB-DSB signals with low loss. 5 (38) 6. 10-meter radios are popular as Ham Radios or Amateur Radios because they are a great starting point for beginners. One may argue that 560 feet is ridiculous for a 40 meter dipole, but keep in mind that the data can be scaled down to a 10 meter dipole with similar results. Now, Best 10 Meter Antenna. 4 % wavelength, we get an antenna setup which exactly matches 50 Ohms. 5" per side, about 12'8" diagonal Antenna height vs skip angles. The important takeaway from the above plots is changing the antenna height from 6 feet to 24 feet considerably improves antenna efficiency Good 40 meter NVIS antennas have a broad and forgiving range of heights from quite low anytone meter 2024 callsign Sirio yaesu ALINCO ss9900 Mckinley lincoln frequency display supply list 2011 call 6900 2023 2022 chart antenna software president 9900 power sign QRZ Database Charlie Tango 11m DX Radio Group Forum :: Help and Discussion Forums :: Antenna Discussion Figure 1 shows the simple geometry of the simulation of a full size groundplane antenna at 0. and in meters. 6: 1. 0 MHz is the lowest specified frequency that it will tune to at 200 inches in overall length. $203. The frequencies range from 28. You want as much energy as possible at low angles, Since you’re referencing an HT, provided you’re 2 meters above ground with the antenna, there should be effectively no difference in radiation pattern. For transmitting antennas, it's best to get at least 1 wavelength off the ground. 3 i had the original one back in late 90s i think it was called the ranger something any way!! this sirio 2016 is amazing, at only 18. 2”) on each side. However, the actual resulting For structures, the highest point of your antenna must not be more than 20 feet above the highest point of the building or tree on which it is mounted, or 60 feet above the ground. What is the best height for your antenna? The author considers factors that can help you decide. Because of the higher average height, the 200 ohm version doesn’t suffer quite as much from the lower height as the 112 ohm version does, and gives about 1 dB improvement at low angles. NOTICE: The Midwest 6 Meter DX Group will be set up at Hamvention in XeniaBOOTHS 9107-9111COME SAY HELLO! +1. Crap Joined: 03 Dec 2016, 11:07 Call Sign: Lemmy Location: Poland Has thanked: 4 times Been thanked: 7 times. Shop HF Vertical Antennas and Packages at DX Engineering. 5 wavelength height. You will need a SWR meter. 00 ft. Out of stock. The 60 foot limit on antenna height for the 11 meter band is a rule. In the first two columns, the antenna's height Enter The Frequency For The Dipole/Vee Antenna Calculation Use entries like 7. Antenna Wind Survival: 90 mph . 973m) the optimum height for any antenna, is the one that puts the strongest signal into the place you are trying to talk to. one full wave half wave would be 18 foot1. New comments cannot be posted. How to calculate your height in cm; Height conversion chart; How to calculate your height in cm. 000 11 Meter Loop Antenna You can make it a square, round, or even a triangle. 99. Reply reply A traditional formula for the length in meters is 306 / MHz (or 1005 / MHz in feet), but, (11) 11. Main Features. There are lower height limits if your antenna structure is located within two miles of an airport. 3: 170. I Dipole Antenna Calculator. 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