ente is a user on chaos.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
TIL there is a web-based #SDR you can use to listen to number stations or other radio transmissions, zoom into the spectrum and look at where interesting things are going on. Fascinating! http://websdr.ewi.utwente.nl:8901/
@ente There's more of those than just this one. I think it was rtlsdr that contained the tool for hosting this, not 100% sure tho.