The perfect open-wire Dipole Antenna IMHO. Post #1454.
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One of the easiest and most effective HF antennas you can make is a properly designed half wavelength dipole mounted at least 1/2 wavelength above ground for your chosen band of operation.
Stan Gibilisco (W1GV) does an excellent job of explaining the theory, construction, and use of HF dipole antennas. As Stan explains, this antenna is capable of multiband operation because of a balanced feed line used in conjunction with a balanced antenna "tuner" mounted at the end point of the balanced feed line. A convenient length of 50 ohm coaxial cable (such as RG-8, RG-8X) run from the "tuner" to your rig completes the antenna system. An automatic antenna "tuner" simplifies the tuning process. Be sure each antenna element is cut for the lowest band of use.
Stan calls this HF antenna the "perfect open-wire dipole" because of its multi-frequency capabilities, inexpensive cost, and ease of assembly.
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Aloha es 73 de Russ (KH6JRM).