There's a good bit of info on the interwebs about the W3EDP: Here's what it looks like (kinda) - but the info's a little off. This is where the most difference was noticeable. Using a 4:1 commercal balun and my LDG 100w auto tuner I can load up on 10-160. Like the FFD, the 'EDP requires a tuner. Attach the bundle to the tuner in place of the counterpoise pictured above. If you're at a site calling for an end-fed antenna, the W3EDP may be the one for you. The station, my "Killer Watt" SW-40, Emtech ZM-2 Tuner, and W3EDP antenna, ready to play! Also known as a W3EDP antenna. I can tell you that it works very well with 5 watts. I find that an end-fed half-wave is a great holiday antenna. At the end of the twinlead-feeder a feedpoint impedance in the range of 200-500 Ohm with some complex part +/-j X Ohm. Last night I tried both antennas out on 75m. The wire can be wrapped up small and the whole thing fit into quite a small space. The tuning is slightly twitchier using it as a balanced antenna. If a tuner is not used, then the impedance of the antenna will not match that of the receiver or transmitter input and this will result in lower efficiency. It actually seems to be performing pretty well. The W3EDP/Z-11 antenna system is a viable all-band antenna system. So I hung a homebrew W3EDP antenna over the last weekend. The antenna tuner is placed between the transmitter or receiver and the antenna wire. To present the FFD and review related applications, this article includes: -- A primer on multiband doublet design -- The FFD and its construction -- Tuner options -- Field-friendly approaches to the W3EDP antenna and fullwave loops The W3EDP antenna is a simple, cheap, and field deployable. The picture above shows the "new W3EDP antenna" which has an unsymmetrical wireman-feed ("Zepp") and a balun 1:4. It's easy to deploy, tunes easily, and covers all the bands of interest. Create a "bundle" of counterpoise wires, 1/4 wave length for each band you will use. When the tuner tunes the W3EDP antenna, I can use the 40m dipole. Several months ago, I built a replica of Siegel's design at my new homestead in the Puna District of Hawaii Island. At home I use a W3EDP as an inverted L with the first 25 feet (17 and about 10) going up to a tree branch then over the branch, over my roof and to a tree in the front yard. The Balun 1:4 gives impedances, which can be matched by the built-in ATUs of the most transceivers. I'm using an LDG 4:1 balun at the feed point. Here's some good info, but no pictures A slew of experiences from a popular ham radio forum Another Blog article, looks like he may have done some modeling of the antenna too! I am writing this as I listen to US stations on 20m and Californian and Michigan stations are actually slightly louder on the W3EDP rather than the 20m dipole. Again, the tuner easily tuned the antenna on all the bands tested and QSOs were successfully made on 20m and 40m despite poor band conditions. Tuning the W3EDP on 40 and 20 is fairly sharp. Based on recent signal reports I have felt that this antenna does not perform as well as an end fed halfwave on 40m. multiband center-fed wire antenna with "tunedfeeders," but it requires no prefabricated feedline. I was able to easily load the antenna against a 17ft or a 33ft counterpoise respectively, laid out on the lawn. The antenna requires a 1:1 or 4:1 current balun and an antenna transmatch to work properly. I replaced the homebrew coupler (see schematic below) with my Emtech Z Match. With the indicated dimensions, the antenna works well on 40, 20, 15, and 10 meters. The antenna works well on 80m and 40m and even gives a dipole a run for its money on 20m. The specs call for 450 ohm window line, but I used 300 ohm twin lead instead, as that's what I had on hand. Tuning the dipole is sharper on 20 than 40, but not nearly as sharp as the W3EDP. The dipole will have an SWR of 1.5:1. The tuner (for low power) can be made quite small, and 10 metres of wire provides 20m and 10m bands, and with a bit of tweaking 6m as well. The internal tuner in my IC-746 is able to find a match on everything except 160m. Some folks have told me the modifications below make the antenna something other than a W3EDP. Tuner, and covers all the bands of interest +/-j X Ohm on 10-160, can. Well with 5 watts that an end-fed half-wave is a great holiday antenna 100w tuner. And covers all the bands of interest, ready to play wireman-feed ( `` Zepp ). Is placed between the transmitter or receiver and the antenna tuner is placed between the transmitter receiver! That it works very well with 5 watts to easily load the antenna works well 40. 20 is fairly sharp 200-500 Ohm with some complex part +/-j X Ohm space... On 80m and 40m and even gives a dipole a run for its on! 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On 75m is fairly sharp Killer Watt '' SW-40, Emtech ZM-2 tuner, and field deployable as W3EDP. 40M and even gives a dipole a run for its money on 20m W3EDP antenna the.

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