I’ve built a project titled “Civilization Heartbeat Sentinel” — a Raspberry Pi + SDR system that monitors FM, DVB-T, GSM, ADS-B, GNSS and other signals to verify whether key infrastructure is still active.

Here’s the GitHub link: https://github.com/Telefonorosso/heartbeat-sentinel

It's a work in progress / non-working project atm... Thanks for your time!!

Best regards, Francesco Talarico - Rome - Italy