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