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Here's an easily made dipole antenna for 40 and 20 meters that could be used for portable, home, or emergency operations. This antenna can serve as a backup antenna for the 2017 ARRL Field Day Event, set for 24-25 June 2017.
If you follow the step-by-step instructions from "RC286", you should have a working 40/20 meter dipole antenna in a few hours. Most of the materials can be found at the nearest hardware store or building supply outlet.
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Aloha es 73 de Russ (KH6JRM)