Here's a simple solution for building a multi-band HF dipole antenna that doesn't require an antenna "tuner", loaded elements, or antenna traps.
In this video, WD0AKX (the "Radio Ham Guy") shows us how to design, build, and test what is called a "Fan Dipole" Antenna. If you cut the wire for each band carefully, you won't be forced to use an antenna "tuner" to bring a single wire into use on multiple HF bands.
As designed, this antenna covers the 40-20-15-10-and 10 meter bands. Although an antenna "tuner" is not needed for this antenna, you can use one to "tweak" each band if you so choose.
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Aloha es 73 de Russ (KH6JRM).