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![]() "Mark Keith" wrote in message om... "Dave VanHorn" wrote in message ... "Mark Keith" wrote in message om... George Cronk wrote in message . 154.205... Does anyone know where I can get plans for this antenna? Materials needed to build one? Thanks You would be better off with a 1/4 wave ground plane on 2m. Seriously. And one of those can be as simple as five 19 inch pieces of wire and a So-239 connector. MK Why would he be better off with a 1/4 wave, with it's large vertical lobe? Cuz it's easier decoupled with it's 1/4 wave radials, and is less likely to have feedline radiation than the funky 5/8 antenna with 1/4 wave radials. In direct comparisons here, the 1/4 GP was a good bit better than the 5/8 with 1/4 radials. Interesting. You obviously have developed a far superior measurement technique than most antenna engineering firms, and maybe even NIST. Your results disagree with pretty much everyone who measures antenna gain professionally, and the ARRL handbooks, but hey they must all be wrong then. Though it's entirely done in the HF spectrum, a pretty detailed analysis is presented he http://www.cebik.com/58-3.html A good ground, and cleaner near-field space, is easier to come by at VHF and UHF, so I would expect results to be somewhat better than what was seen here even at the high end of the HF spectrum. If you google a bit, you'll probably find some articles on converting a CB antenna to a 5/8 2 meter antenna. |
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