#business
# [[Epistemic status]]
#godel-uncertain
# Universal
#outdated #idea
https://www.rtl-sdr.com/
I used it in the past to intercept boats and airplane communication and show on a map
I coded it in like, 2 hours...
You can collect GSM networks and everything too, like space stuff
Could build a box all packaged that host a web page showing all radio communication around on a map etc
pain in the ass for dealing with government legal stuff