"Cecil Moore"
Approximately a foot and a half of 75m Texas Bugcatcher
stock will be self-resonant at 4 MHz. That's 90 degrees of
antenna stuffed into about a foot and a half of coil.
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But that self-resonant coil is not the electrical equivalent of a 90-degree
linear antenna. A coil by itself is not a very efficient producer of EM
radiation, whether self-resonant or not.

RF