S2 Underground on YouTube puts out a lot of quality radio content.

Check out their latest on Bare Minimum Comms Strategy.

00:00 - Introduction and Reasoning 02:16 - Meshtastic 08:39 - Satellite Communicators 12:56 - HF Radio 14:03 - Thinking Strategically 18:26 - Zero-Trust Environments 27:17 - Non Radio-based Comms 31:45 - Closing Thoughts