Magnetic Loop Antenna Tuning

Dan (KC4GO) shared a video of his magnetic loop antenna being tuned across the 40 m band. The narrow bandwidth of the antenna can be seen as the peak in signal level moves up and down the band.

The occasional large vertical jumps in the panadapter display (upper half) are caused by distant lightning activity. Each of these signal bursts also appears on the waterfall display (lower half) as a very thin, horizontal line, since the lightning energy is very broad-banded.

While the video is playing, you can type f or click on the box near the bottom right corner of the player to switch to a full-screen view of the video. 

Thanks, Dan