2m FT8 inside Alps ...
You see a single station with a clean signal.

Except that this signal is divided and spread in frequency by reflections off the mountain walls and diffracted by the peaks.

#hamradio

@F1RAD Knife edge diffraction or an overdriven amplifier. *whistles innocently*
@F1RAD That's more likely to be an aircraft bounce. Doppler makes it look like this.
@F1RAD Your post reminds me I need to get my 2m properly set up so that I can join the VHF/UHF events once more. Even with a compromise setup they are massive amount of fun.