>>2927570
Software defined receiver, it's a radio receiver where the functions of modulation, demodulation, etc. are made by a computer
for example :
http://websdr.ewi.utwente.nl:8901/
the green bands are ham, pink are broadcast
Here you have a map of them, receiving various things, from HF to VHF, UHF so you can listen to one close to you :
https://rx-tx.info/map-sdr-points?freq_of=&freq_to=&bands=1032&country=All&title=&qth=&url=#close

in picrel you have USA ham bands