#VLF/#LF/#MF spectrum waterfall recorded for 5 hours overnight with #lightning in the area. Unfortunately the time is incorrect but I started this around midnight, a few hours later a storm system came through. Used an #RTL-SDR and a modified MLA-30 active loop antenna in the attic.

The solid line around 0.060 (60 kHz) is #WWVH. All the stuff on the right pat 0.50 (500 kHz) is the AM broadcast band.

There's harmonic/image of #WWV in there somewhere, probably due to a cheap setup but worth more experimentation to clean up, particularly needs better AM broadcast filtering (it's not supposed to show up). The signal path is <ActiveLoop>--<Power Injector>--<AM Band Filter>--<Upconverter - Ham It Up Nano>--<RTL-SDRv3>

#GQRX #SDR