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disaster-radio
A (paused) work-in-progress long-range, low-bandwidth wireless disaster recovery mesh network powered by the sun.
https://meshtastic.org/
Also worth of mentioning for different purposes: https://github.com/ExpressLRS/ExpressLRS
Best luck with everything. слава україні!
https://meshtastic.org/
Also worth of mentioning for different purposes: https://github.com/ExpressLRS/ExpressLRS
Best luck with everything. слава україні!
(btw. no affiliation here, just a happy customer)
Think about using fiber optics at least for longer fixed paths: a couple routers with SFP can provide a gigabit connection over several kilometers, and the fiber cable can be easily buried so that it's not easy to notice and doesn't hint the enemy that a transmitter is operating nearby like WiFi would certainly do.
For very slow and long distance communication, namely text messages, LoRa can be an option to which encryption can be added externally. All other considerations about radio transmission remain valid for LoRa too, however. You may find these links interesting:
https://disaster.radio/