I tested 4 lengths of random wire antenna in the house.
feet, length x4 (meters), MHz
12, 14.63, 20.5
15, 18.29, 16.40
25, 30.48, 9.84
35.5, 43.28, 6.93
spacing was 2-3" apart. time was 1/2 hour before to 1 hour after sunset, starting with the high frequencies first.
results:
20 MHz, no...