How does that old story go? If it appears to work well on 10 meters, it must work on all the bands right? As it turns out, the same indicator seems to attenuate the RX signals down on 20 meters by more than 10 dB. Removing the indicator returns signal strengths to normal. More experimentation ahead (will try a few other core materials and vary the number of loop turns feeding the LED)! #DIYFail #HamRadio #MagLoopAntenna