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Horizontal dipole reflectors are 5% longer than the half wavelength (half wavelength in this case is 7.8 ft, with a reflector length of 8.2 ft). Would the folded dipole reflector length be 8.2 ft, or is it 1.05 times one of those dimensions on that calculator? Would the spacing still be .15 wavelength? And what about the director lengths? The director lengths are supposed to be shorter than the receiving element, but with the folded dipole, the 47.5% wavelength directors would be longer than the folded dipole.
Regarding the balun, one of those "pitchfork" twin leads should work, right?
As for the attic, even though I don't have metal roofing, there still isn't a window up there. Is height more important than a clear line of sight?
And a non design related question: Does anyone know where I can get a 60-66 MHz band pass filter?