I was excited the other day to re-discover this beautiful tool rtl-power from keenerd! In combination with some handy scripts made by Superkuh and heatmap.py generator I've managed to burn a lot of cpu cycles and many Gbytes of disk space. But in the end, one can see the RF spectrum from another view! Here you can see some weird satellite signals coming down on earth on the L-Band!
Enjoy!
Enjoy!