VLF Sunrise Sunset effect at VLF using SDR and "LIL" Low Impedance Loop
Several folks have asked about the propagation at VLF frequencies.
Here is a video I made about a specific VLF propagation mechanism.
Take a look at the Sunrise and Sunset effect at 40.750 KHz
Using the AirSpy Discovery, the "LIL" Low Impedance Loop, SDR Console V#3 and Radio SkyPipe recorder.