If you're having trouble viewing this video, please insert this title link into your browser search box: https://www.youtube.com/watch?v=oTPWYfA_uuQ. This antenna designed by Martin (G8JNJ) and built by Tom (9A5TOM) is another simple, easily erected, and versatile HF vertical antenna suitable for both emergency and portable operations. The antenna is loosely patterned after the popular Comet CHA-250, but doesn't cost as much as the commercial model. In this video, Tom uses a 7 meter/22.96 ft telescoping mast to support a helically wound antenna element. Like the CHA-250, the key to a successful operation is the matching transformer about midway up the mast. The video shows how the transformer is built and gives you some SWR readings for the amateur radio bands between 80 and 10 meters. The antenna doesn't require a transmatch (i.e. "tuner") for successful operation. Tom says the antenna works best on 40-10 meters and performs as well as the CHA-250.
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Aloha es 73 de Russ (KH6JRM).