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How about some antenna experiments during the upcoming ARRL 2017 Field Day Communications exercise on 24-25 June 2017? In this video, we see how a group of radio amateurs used a long wire antenna supported by a helium-filled balloon for contacts on 40 meters during the 2016 ARRL Field Day held north of Vero Beach, Florida. The antenna worked very well. If you're really ambitious, try a 160 meter end-fed wire supported by a helium-filled weather balloon. Don't forget the counterpoise/ground radial system, a 9:1 balun, and an antenna "tuner" to round out the antenna package.
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Aloha es 73 de Russ (KH6JRM)