A few random ideas: For short range coverage you may want to consider repurposing commercial hardware (routers, access points etc) that supports OpenWRT, those

A few random ideas: For short range coverage you may want to consider repurposing commercial hardware (routers, access points etc) that supports OpenWRT, those should be easier to find, also used, and way cheaper than specialized hardware. https://openwrt.org/toh/start https://openwrt.org/toh/start Long range communications will require directional antennas, which implies mostly fixed and point to point. Also to achieve line of sight and avoid the fresnel zone obstruction the antennas need to be mounted higher than the highest obstacle in between. Solar power is viable, but battery backup should also be provided. Antenna masts and solar panels would make them visible from distance, and of course although the traffic can be encrypted, they scream all around the air that there is a station operating there; hidden SSID does not make their operation invisible to a spectrum analyzer or any specialized electronic warfare gear - of which the enemy has plenty - that should be taken into consideration. Anyway, Mikrotik makes some interesting powerful wireless routers like the Metal 52 ac which can operate at over 1W both on 2.4GHz and 5GHz. They're conveniently bullet-shaped and can be supplied by PoE, so that you can connect them just behind the antenna (either directional or omni) to achieve minimum losses. I've bought some good WiFi hardware, cables and antennas at netek.eu (now wifimarket.eu) and batna24.com. Mikrotik is Latvian, Batna and Wifimarket are in Poland, you shouldn't have problems shopping from them. Wifimarket today seems to have a very reduced product line compared to a few years ago when I shopped there. They had really good antennas and cheap really good quality parts to build antennas (dipoles to make patch antennas by adding a reflector etc.) that would come very handy on the field. You may ask them if they still sell them elsewhere. (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/ https://disaster.radio/ https://meshtastic.org/ https://meshtastic.org/ Also worth of mentioning for different purposes: https://github.com/ExpressLRS/ExpressLRS https://github.com/ExpressLRS/ExpressLRS Best luck with everything. слава україні!