Mine would be creating pen and paper ciphers for my made up secret communication needs.
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Actually, you are quite lucky with SDR, as there are many such stations on the Internet where you can tune in locally at that location and listen as if you are there. I operate one for listening to our local ham radio frequencies on VHF at https://openwebrx.gadgeteerza.co.za. But mine is very simple compared to some of the more complex one’s available.
Oh huh, this seems cool. Excited to screw around with this new knowledge