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With a little ingenuity, you can turn your HF vertical into a higher gain antenna. In this video, Stan Gibilisco (W1GV) shows how a pair of phased verticals, separated by a 1/2 wavelength at your chosen frequency, can deliver up to 3dBd gain over a single vertical element. I've built a few of these antennas for 20, 15, and 10 meters, and they all have performed well. Now that solar activity is beginning to favor the lower HF bands, you may want to build a phased vertical antenna system for 40 meters. Unless you have a large lot, such an antenna for 80 and 150 meters may be too large. Stan's video tutorial is good introduction to building a phased vertical antenna system.
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Aloha es 73 de Russ (KH6JRM)