Can I make the loop larger, smaller or a different shape?
The short answer is yes many hams have limited space or want to use existing supports such as trees. Here are the general rules about loop size and shape: 1) The current in the loop (and thus, signal voltage across the feedpoint terminals) is proportional to the area enclosed by the loop. A smaller loop will capture less signal, which will require more preamplifier gain to give the receiver a proper signal level. The loop is too small when the quiet band signal level falls below the noise floor of the receiving systen (preamp/feedline/receiver). A larger loop will capture more signal, but at some point its mode of operation changes. A loop is too large when it starts to act like a “delta loop” or “quad loop” instead of a “small loop.” A loop is too large when the overall wire length is about 0.3 wavelength; approx. 0.1 wavelength across the diameter or longest diagonal dimension. The published dimensions (25 ft. height, +/- 15 ft. across) are right at the upper limit for operation in t
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