Short 80m dipole. 95 (kit) Shorty 4080K2A - $149.
Short 80m dipole ( the 40m vertical antenna was detuned by removing 1. If you run the numbers on a shortened dipole compared to a full size you will find a dipole around 70% of a full size half wave will be within 1dB of a full size half wave dipole. com. Shorty 4080K2 - 40m/80m Dual Band Shortened Dipole - $129. The 80m dipole wire(s) must be shortened due to space limitations. YBØFH, ato short 80m Dipole-nya Nadisha 4S7NR (yang dikenalin ke publik sini oleh mas Edhie YCØHLE di BeON edisi 0606) tetapi ketiga design ini akan membikin repot mereka dengan kemam-80 -- 40m 40m shortenedshortened FAN DipoleFAN Dipole This means that if we try to feed 7 MHz to 3. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. 7 MHz, where the impedance is about 105 ohms. 20 MTR VERTICAL MID-LOADED 2x3 MTR (2x10 FT) DIPOLE. 80 meters band linear loaded dipole. The dimensions include the width between the balun connections. (Having just set it up again for testing, I strongly recommend tying two ropes to the knot at each end, and securing the various wire ends to those The company’s precision-crafted single-band full-size, single-band shortened, two-band shortened, and multi-band trap shortened rigid rotatable dipole HF antennas, ranging from 9. Inverted Vee Dipole at quarter wave height Look what happens when the dipole is at 20m height. May be of interest to anyone wishing to get on 80M (3. 84 ft. 80 Meter Off Center Fed Multi Band Dipole Antenna. The Center-Loaded Off-Center-Fed Dipole (CL-OCFD) was invented and first described by yours truly, Serge The 6 m-band (50–52 MHz) is the 14 th harmonic of the 80m-band. 8000. It is quite compact but TWO elements for 80-s and not one [Off-Center Fed Dipole] [VERTICAL Antennas] [Vertical Dipole Arrays] [Open-Wire-Fed ANT] [CUTTING EDGE ANT] [ Wire Beams ] [ANTENNA MATCHBOXES] [antenna tuners] [Antenna Tests] All short, loaded vertical antennas on 160 or 80m tend to have a low impedance, and higher SWR. 95 (kit) Shorty 4080K2A - $149. I will not extend this side with a coil. After some research I found an Optibeam OB2-80s. Distance from center of antenna to the center of the coil in feet (Must be less than half the total antenna length given above). 88 - Indoor Loop Antenna for 80m to 30m. If you have height, you even can put up a quarter wave vertical or an inverted L. They do work well as an all band antenna and are simple to put together. I have been using this antenna for more than a year now. Diameter of the conductor 80m short vertical KGD-dipole Primarily for construction reasons, and because I converted some of them from center-loaded dipole experiments. 93 - Picnic Vertical Wire Antenna. A conventional coax-fed, half-wave dipole doesn't provide a low SWR over the entire 80-meter band - an inconvenience for those of us who like to operate phone and CW on that band. Complete with approximately 50 feet of coax; 80m short vertical KGD-dipole To make a shortened dipole resonant, some form of loading is required. The result would be a very high (impractical) impedance at 7 MHz - whereas the impedance of an 80-meter dipole, used at 3. This package will give you the same band coverage 40m - 80m - 160m Short Dipole Antenna. This can be expanded to include any combination of shortened and full size dipoles that you wish. Use some short wraps of tape to hold the wires in each bundle together, especially near the end of each wire. Is the slope and lack of wire counterpoise going to prevent effective use of this antenna?” Comment by 'F5SJF Jerome' on 27 Sep 2016 - comment “Hello, build thid antenna. Reviews For: OptiBeam OB2-80s 2el extra shortened 80m monoband Yagi Category: Antennas: HF: Yagi, Quad, Rotary dipole, LPDA. 160m, 80m, 40m Curtain Zepp Antenna. This rugged antenna features a good an antenna for 80 meters band for those who does not have enough space to setup a halwave wire dipole that is aprox 130ft or 40 meters the antenna is an open wire fed shortened dipole. A simple broadband dipole for 80 meters. Every coil has an inductivity of 120 microHenry. The 15M band is covered by An Off Center Fed Dipole is an easy way to use one antenna for multiple bands. Strays WWII MERCHANT MARINE REUNION for multiband coverage and physical short- ening. NONESENSE! The classical feedpoint of the windom will give you the best SWR curves for a few of the bands, but if you are willing to accept a slightly higher SWR, it is possible to cover additional bands. The SWR (per 4nec2 – a free antenna modeling software package available from Arie Voors) when fed at the center is as follows. I use commonly The drawing below is a diagram of a lumped-constant loaded dipole antenna that is intended to fit in available space, rather than requiring a full 1/2 wavelength, at a specified frequency. I thought this would make a good antenna to Antenna, NVIS, 80 and 40 Meters, Without Mast, Shortened Dual Dipole, Portable, Kit. The antenna above has been described by Nadisha, 4S7NR and may be of interest to anyone wishing to get on 80M (3. This is an End Fed Short Wire wire A shortened (50 foot) 80 meter dipole radio antenna (Note: this is the full length version that is referenced from the BVARC Newsletter – November 2009 short version) Summary: The LKJ Wednesday Night Special Antenna is a shortened 80 meter, coil loaded, dipole antenna Good article. 5MHz) that have limited space available. , 30. 90 - Double-Delta Antenna 80m and 40m. See what you think. This was more convenient with tube transmitters that could tolerate a higher SWR, however. Always check EM Field Exposure. this antenna just requires about 24m of free space instead of 41m that a normal half wave 80m antenna needs to hang up the so called loaded dipole uses a coil in every dipole arm to electrically lengthen the mechanical too short dipole arms every coil has an inductivity of 120 microhenry . 3 s-unit down from a 1/2WL folded dipole. Part Number: DXA-DXM80 Not Yet Reviewed Describe your experience with the OptiBeam OB1-80+ (extra shortened 80m rotary dipole) and tell us why you give it the rating you did (required). Ideal for limited space. 95 (assembled) Click for a PDF product sheet. Short length end starts at about 25' then would slope down to nearer 9' or 10'. The document describes a shortened 80m dipole antenna for amateur radio operators with limited space. Two of the dipoles are dipoles with loading coils, to fit in available space. 6 meters or 57. At 21. 525 MHz. the length of a normal end insulator). Both of these antennas need some form of radials for reasonable performance. Let’s show you how we got on. 1B: "Shortened Dipole Study for Conditions On BVARC’s Rag Chew Net", Larry Jacobson (K5LJ), Rick Hiller (W5RH), expanded from same-title article in "Newsletter of the Brazos Valley Radio This design exercise resulted in a new kind of antenna which I dubbed Center-Loaded Off-Center-Fed Dipole Antenna, or CL-OCFD for short. If the SWR of this antenna is too high for your transceiver or linear Antenna projects for 80 meters band, a curation of 185 useful links about 80M. This antenna is only 7. 91 - Inductance-Loaded Shortened Dipole for 160m. 25 meters from the central insulator to the coil. As with any antenna system, do always check that you comply with relevant field exposure limits. One standard solution is "inductive loading": adding a loading coil to each "leg" of the dipole. L2 also is 12 feet and the overall length is 48 feet. 85 ft. The shortened dipole uses loading coils to operate effectively on the 80m band at around 3. 0MHz, 1000W PEP, 50. Some years ago I was experimenting with a dipole kit for NVIS operation on 40, 80, and 160m. But I don't have the means to determine Listed under the Antennas/80M category that is about Homemade projects for 80 meter Antennas. Short Dipole for 80 Meters. In IARU Region 2, the 80m band extends from 3. txt) or read online for free. With the included OptiBeam Multi-Switch Rotatable Dipole Antenna, Coil Shortened 80m, Tunable 3. The 80m dipole was already on its 48 foot mast with a DX Engineering balun and original coax. 4m long (about 40 feet). This time I installed in a An alternative for 80m is my end fed "40m+short 80 " available for the RSARS web site on this link This is only 12. A dipole resonant at 7. 47 . The Tunable over the full 80m ARDF frequency range (3. 8 MHz only. The gap in the top section can be a few inches wide at HF (ex. 5 MHz, is a very workable 72 ohms (in fact, closer to 50 ohms if installed at 30-50 feet above Dual-band dipole elements. (pictured below) The shortened 80M dipole is 20 metres end-to-end and fits nicely across my backyard. IMPORTANT Note that at my QTH, the installation height of dipoles is basically limited to 2 m (6 ft). Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. 10m -160m Multiband “Z” Antenna. Most people still believe a Windom MUST be fed at the 1/3 - 2/3 point. 0 MHz, 300W PEP Max, 100W Dig. The total length of 130′ multiplied by 0. With my Dentron Super Tuner, I can tune the antenna on any HF band 80m and above, and it seems to work just as well or better on 40m and The antenna above has been described by Nadisha, 4S7NR and may be of interest to anyone In several years or running a short, openwire fed vertical dipole (6m per leg), I have determined that this antenna (in its vertical form) was on par with my full size 80m horizontal dipole at 40 ft. –short 80m (160m) antenna. Handles 1500 Watts. 5 to 3. DUAL BAND DOUBLE BAZOOKA antenna covering the 80 meter and 40 meter bands. I decided to make a trapped 80-160 meter vertical dipole with the feed point at 11 meters: 80-160 metri This antenna is to be used in a small space Dipole terminals spaced 6 inches apart. 2 wavelengths, it hi the only trees i have to use are only far enough apart for 40 meter dipole when i can afford a sturdy enough pole i can build the 80 meter or even a 160 meter dipole,i’m using 600 ohm ladder with a ldg-600 tuner, is the 80m short vertical KGD-dipole Ref. Antenna projects for 80 meters band, a curation of 185 useful links about 80M. L1 is 12 feet. Here they Construction Details for a half sized dipole for 80m: Figures apply to the VK novice band There is a general rule about shortening a dipole without regard to its impedance Total length of antenna in feet Open the dipole length calculator in a separate page. I have used a homebrew 80m loop for years. JUST 77ft (32ft short side, 45ft long side) 1500w SSB/PEP 200w CW. As long as the physical length is longer than 0. 7 feet overall. One thought on “ A short dipole for 80 meters ” Anonymous says: February 4, 2023 at 3:15 am The lengths given in the chart above are those of the full overall length (total breadth) of the bottom half of the linear-loaded dipole. Part Number: DXE-NVIS-8040SNM. The exact A Truly Broadband, Efficient Low Band Dipole - 2 - W7ZZ and N6RY, c. 94 - Laid-Back Quad Antenna 80m dipole shortened. Free Shipping; Buckmaster OCF Dipole Antennas DX-OCF-HP160. com/playlist?list=PLcC64tNkZB7zFt6NV9fnnd %PDF-1. 80m Short Dipole - Free download as PDF File (. Antennas: 80M. This happen because my neighbourhoods don't leave me to prop a simple wire. Mine was resonent at 1. The short leg OptiBeam OB1-80+ Shortened 80 meter Rotary Dipole SSB+CW This 80 meter SSB and CW Rotatable Dipole is a heavy-duty single element that is only 17. It rewards the dilligent worshiper who builds full size antennas and punishes all others. 51 MHz – 3. I've done this with my 80M dipole in my cramped 100 foot wide lot after reading about it in some article. It is shorter than a full size 80m dipole at 132 feet, at only 48 feet total length. 160 is VERRY narrow banded. 6 MHz) Vertical polarization; Easy set-up and take-down; Adequate efficiency; Simple; Rugged; The design is a short vertical dipole (SVD) antenna, with a resonant matching network at its center feedpoint. . 160m Half-Sloper Antenna. 3 over the majority of the 40m band. How start: When I was amateur radio I looking for a high efficiency antenna which need limited space on eighty meters band. Many hams don’t have room for a full 160m dipole, so I started designing coil-loaded antennas, and discovered it was relatively easy to make a single element work on both 40m and 160m, with a length roughly that of an 80m dipole. The longer leg can be about 16 meter. Each side of the dipole is broken up by a coil that presents a high impedance at 40 meters and acts as a loading coil on 80 meters, allowing the antenna to resonate on 80 meters even though it is physically shorter than a half-wavelength 80m & 40m DUAL BAND HOMEBREW 2 EL SHORT BOOM YAGI. The drawing shows three dipoles. Multiband operation is an option. This is for the antenna only and does The drawing below is an example of what can be done. 80m short end-hat-loaded verticals My really short 20 mtr dipole (2x 0. If the antenna is center fed, it will still be balanced, with equal voltage and Short 85 foot long dual band 80/40 Meter dipole antenna is full-size on 40 Meters and has ultra-efficient end-loading on 80 Meters. 5 ft. Listed under the Antennas/80M category that 3J. 5 and 24. 50 – 4. 7 feet in length. One day I've decided to change my one element rotary dipole for 80m band (UB80) for some two elements beam. Optimum height for low He built his elements from some sturdy wire and homebrewed spacers made from PVC pipe. 5 MHz (80 meter) dipole, the 7 MHz current would be at a minimum (null) at the center feed point of the 80-meter dipole. So I have shortened it 6 inches on each end and that was about half what I needed. 160m Linear Loaded Sloper Antenna. Finished Dipole Spacer. Listed under the Antennas/80M category that is about Homemade projects for 80 Since 20m trap acts as a loading coil on 40 and 80 meters and 40m trap acts as a loading coil on 80m the antenna turned out to be much shorter than a full-size 80m dipole, and thus probably less efficient on both 40m and 80m bands. I have been meaning to upload SWR curves for this project. 3 MHz the SWR 86 - Fan-Dipole Antenna for 80m to 6m. 160m Inverted Delta Loop. The 40M and 20M dipoles are separated by about 30 degrees from each other, and are arranged as “inverted V’ees”. Hall, “Off-center loaded dipole antennas”, QST Sept 1974, 28-34. Tests with GM4FOZ on the RSARS 40m Net gave a normal half wave 80m antenna needs to hang up. 5 to 50. The total length of this antenna is 7. 2 feet. The DXZone; News; Reviews; Links; Inside DXZone; Ham Radio Software; This short dipole antenna has been described by Nadisha 4S7NR and may be of interest Hits: 1347 | Votes: 1 Rotatable Dipole Antenna, Coil Shortened 80M and Full Size 12m, Tunable 3. Below is one example of how to build an 80 metre band long wire antenna for a house with a smaller garden. 1B: "Shortened Dipole Study for Conditions On BVARC’s Rag Chew Net", Larry Jacobson (K5LJ), Rick Hiller (W5RH), expanded from same-title article in "Newsletter of the Brazos Top band (160m) is a harsh mistress. 98 meters for each side, wire 14AWG, distributed as follows first part: 6. This antenna covers 65 kHz of 160 meters, 75 kHz of 80 meters and the entire 40-meter band with SWRs under 2:1. 5See note 2. Consequence is that the antenna is a bit off centre. The effect of ground will still be important, current will be maximum in the center and very close to zero at the ends with maximum voltage at the ends and minimum in the center. 5 long and can fit into modest plots Subject: [FT817] 80m Dipole Loading (shortening) Coils I picked up a set of Spi-Ro LC-80 loading coils to shorten a 80m dipole from 130' to 69'. With a tuner, you are also supposed to be capable 80m short end-hat-loaded verticals Ref. in length, designed for coverage of the lower portion of the 80 meter band, 3. 5 MHz to 4 MHz. 89 - Indoor Loop Antenna for 80m. 2015 Fig 1. The biggest ‘issue’ I’ve had is that tree branches like to eat them in windstorms. 15 MHz has a 3rd harmonic resonance around 21. 3 meters = 7 meters each leg + length of the coil; I replaced the nest was replaced by a half-size G5RV in a “lazy” inverted V configuration, tucked up in the rafters. A good example of this would be a standard 40- and 160-meter dual-band dipole (2B4016) and an 80-meter full-size dipole in an inverted vee configuration with the same common feed point. short dipole for 80m. 160m Inverted-L. --73, Cecil, w5dxp. 5m of wire for these tests) The 40m-short 80m antenna was tested as a fairly low sloping inverted “L” as shown on the first page. The exact inductivity should Dipole legs are normally just under 25% for each dipole leg (depends on height above ground) but you can shorten this to between 16-18% by loading it up in a linear fashion. DXA-DXA1580: Coil-Shortened 80M, Full-Size 15M, 38. Product Compare (0) Sort By: Show: 1. More videos:https://youtube. Healy, "Antenna Here is a Dipole," QST, Jun 1991, pp 23-26. This matchbox is good for this type of antenna. The actual spec from the dipole centre was as follows: Dipole centre to coil: 3. The best antenna is the simple Dipole. Certainly not enough room for a full size dipole for 80M. The so called "loaded" dipole uses a coil in every dipole arm to electrically lengthen the mechanical too short dipole arms. This is commonly used to operate 15m using a 40m dipole, or 10m using the 7th harmonic resonance with an 80m dipole. pdf), Text File (. 87 - Capacity Tuned Folded Loop Antenna for 20m. EZNEC sez this shortened folded dipole antenna is about 0. Other than getting temporarily downed by a nearby tornado, it has been trouble free. Super-Sloper Antenna. To short but not much. Being such a high YBØFH, ato short 80m Dipole-nya Nadisha 4S7NR (yang dikenalin ke publik sini oleh mas Edhie YCØHLE di BeON edisi 0606) tetapi ketiga design ini akan membikin repot mereka dengan kemam-80 -- 40m 40m shortenedshortened FAN DipoleFAN Dipole This means that if we try to feed 7 MHz to 3. The 80m version of the OCF Dipole is supposed to be capable of 80, 40, 20, and 10m bands. I’ve had them in several configurations, including a rough rectangular horizontal set up around a house on a town lot. As seen on his page, the original formula seems to come from an article by J. High performance antenna with world class DX coverage on 80 through 6 meters. The result would be a very high (impractical) impedance at 7 MHz - Dual-band dipole elements. The link to this resource has been on our site since Monday Feb 23 2009, and it has been followed 12066 times. In May of 2008, I dug up my my 20 meter mid-loaded short dipole from a dark corner of my "antenna cemetery". Shorter than that and the efficiency starts dropping off rapidly. The coax feedline runs up the center of the bottom antenna element and is Antenna short for 80 meters. 60 meter (58 feet). Well I find a way to solve my problem. DX Commander #dipole #80m #linearloading The legs of this dipole are only 12. The shortest side must be extended by an coil of about 80uH plus a piece of wire (approximately 2 meter). 4J. 64 (64%) gives the long leg length of 83. Construction Of Linear Loaded Short Ham Antennas. DX 80 OCF SHORT . 4 %âãÏÓ 692 0 obj > endobj xref 692 27 0000000016 00000 n 0000001537 00000 n 0000000852 00000 n 0000001846 00000 n 0000001880 00000 n 0000002031 00000 n 0000002083 00000 n 0000002224 00000 n 0000002541 00000 n 0000003163 00000 n 0000003764 00000 n 0000003800 00000 n 0000004046 00000 n 0000004311 00000 n Review Summary For : OptiBeam OB1-80+ (extra shortened 80m rotary dipole) Reviews: 1 MSRP: 1,900; Description: Extremely efficient trapless 80m rotary dipole with an element length of just 17. 5 inches between each wire as suggested by the army's total length of 39 inches in the original SRI article. I also found a design for a linear loaded vertical antenna for 40m and 80m. My 80 m short (vertical) dipole with center-loading is described on this page. 8 – 25. 70 foot long center fed dipole providing 80m and 40m resonances. You might consider a folded dipole if you have room for a full sized 80m dipole. Note that the spacing between each dipole on the end spacer is 19. THE 4NEC2 MODELING The F-12 80m dipole (EF-180B) is a 68' long, linear loaded element and has performed well at VE6WZ The key to obtaining more bands from any Windom (or OCF) is the positioning of the feedpoint. The loading coils is placed somewhere between the feedpoint and the tip of each "leg". Many hams don’t have room for a full 160m dipole, so I started designing coil-loaded antennas, and discovered it this antenna just requires about 24m of free space instead of 41m that a normal half wave 80m antenna needs to hang up the so called loaded dipole uses a coil in every dipole arm to electrically lengthen the mechanical too short dipole arms every coil has an inductivity of 120 microhenry . Callum, M0MCX. I had LMR-240 Ultraflex on hand for the 50 ohm piece. I have only gad this antenna up a couple of weeks. The minimum installation height of a horizontal dipole is It is simple and gives you access to the entire 80 meter Band with an SWR that is easily handled with most modern rigs and external antenna tuners. Works 80, 40, 20, and 10 m with out a tuner!! Get world class DX all band performance with a tuner. RECENT UP-DATE: IN THE SUMMER OF 2018 THE 2 EL 80-40 YAGI FEED SYSTEM WAS RE-DESIGNED TO ALLOW FOR INSTANT 180 DEGREE DIRECTION SWITCHING. (9. MFJ 80/40/20 Meter Rotatable Dipole A full legal limit efficient 80, 40, and 20-meter antenna that is shorter than a 20-meter dipole. 5 MHz, This is the length of a standard dipole but instead of dividing the result in half, use a 36/64% offset to determine the feedpoint. Wideband 80m Dipole. 5 Kw DUAL BAND Double Bazooka Antenna 80 and 40 meter bands . Although not mentioned in the article, small diameter PVC tubing can be used for the spacers (sometimes Let’s start with a run-of-the-mill 80m dipole up at 40 feet cut for 3. 4 – 4. The resulting length is 133. Off-Center Fed Dipole Design. Tom (M0RMY) and I made one. Its total length is 85 feet. 4m), Kit A shortened Fan Dipole is a dual-band dipole with a full-size dipole also tied to the same center insulator. Solderless , crimped construction. Short dipoles for the lower bands (40 mtrs and below) do not normal half wave 80m antenna needs to hang up. Callum. 92 - V-Beam Antenna for 15m. Healy, "Feeding Dipole Antennas," QST, Jul 1991, pp 22-24. The original javascript was created by Jack Ponton and can be seen here. On 40 m the SWR was very close to 1:1. 7 m, 2x2. Now you can operate the low bands on 80, 40, and 20 Meters with a true rotatable dipole thatÂ’ll blend in with the sky! Take advantage of the excellent propagation of the low bands during Build the 80m dipole Transmission Line Resonator. The other dipole is just a full size for a band where a 1/2 λ dipole will fit. An easy way to 'fly' on eighty meters band. He has a half wave 80m dipole supported 135 feet up in the air. 7-strand, #14 gauge hard copper antenna In the picture below you can see the radiation pattern of 80m dipole at 40m height above the ground level. He’s used this design for the 40m elements of a fan dipole covering the 40m, 20m, 15m, and 12m bands. The end fed antenna is essentially half a dipole, it uses a good earth connection to complete the arrangement. 7 meters; Coil to end of dipole leg: 3. Turn your existing 80-meter dipole into a broadband antenna by simply modifying the feed line. frequency impedance SWR (50 ohm ref) Alpha Delta DX-LB (shorty) dipole Time Owned: 0 to 3 months. Hits: 52707 | Votes: 36 | Rating: 5. Still tunning it for 160 meters,need to shorten it up some more but better than it being to short. A Further Edit: A folded dipole is a dipole antenna with the ends folded back around and connected to each other, forming a loop as shown A shortened dipole will act similar to a full sized resonant dipole in many ways. The DOUBLE BAZOOKA antenna. Estimated Ship Date: Today. 8 feet, are built with quality materials to withstand tough environments. Seems to me to be a small price to pay for a 50 ohm feedpoint impedance. 0 out of 5 stars. 160m Capacitance Loaded Vertical Antenna. (15. 71 ft. But my guess is that (a) you can probably cut the 80M dipole pretty quickly to a desired resonant frequency in the 80M band, and (hopefully) adding the traps won't change things much, but (b) you would need to empirically trim (or lengthen) your "shortened" (and trapped) 160M dipole several times to get it to resonate where you want it to, in Dipole Calculator; HF Trap Calculator; coax trap calculator; Used & Clearance (0) UNUN (17) 80M. The current-distribution along the main elements is such Antennas/Dipole; Antennas/80M; The title of the main category is 80M and it deals mainly with Antenna projects for 80 meters band. EAntenna EA80DXS Short Dipole Wire Antennas. Free Shipping; DocumentationLoading Estimated Ship Date: Today. Only the 40m elements are linear-loaded. EZNEC models of dipoles from the standard formula, fed directly with 50 ohm coax (blue line) or series matched (purple line). 4 A shortened dipole will act similar to a full sized resonant dipole in many ways. For example, an 80 meter dipole cut according to My dipole structure is flat and at an elevation of about 40 feet. 5m), Kit. 5. EAntenna EA80DXS is a Short Dipole, 65. 736m, or 25. 3 ft !!!) ) that can easily be installed vertically is described here. If the antenna is center fed, it will still be balanced, with equal voltage and The MFJ-17758 is a two band, 80- and 40-Meter center-fed dipole antenna capable of handling 1500 watts. All I needed to fabricate is a replacement 50 ohm coax 1 wave in length and a 1/4 wave length of 75 ohm coax. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. Clothesline Antenna. I have heard that the results may change with different elevation and if the dipole is more of an inverted Vee with sloping elements. jkkgyt fcdd ygnauzm sigccegm yuidv zllu cnhsw ctxsk sbb hsdw hdo jgk xpon mgaszs ljyyb