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A LONG time ago I was into SW. I used an 80 meter full wave in an L shape. Yes it was 250' plus. "Coiling" wire won't work too well. A straight wire with length equal to an evenly divisible wavelength will work fine. ie if you're after 80 meters, a 40, 20 or 10 meter wire will work OK. These would naturally be 1/2, 1/4 and 1/8 wave, not the only options. Throw a balun into the mix for more complication. Directional options also abound. A simple wire "tuned" to your frequency of choice can work quite well. Very cheap to have a few different lengths to try. If you find a specific band you're interested in, you can invest in a more elaborate system for that band. I'm sure a "ham" will elaborate.
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