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Just get a radio? Not to be glib, they're well built, mature tech that can go many tens of km from elevated positions. Don't get triangulated in a conflict situation, but it's the thing most likely to work and remain durable/portable under extreme conditions.

I think the Meshtastic site mentions a few boards, but it probably depends too on what features you want. I picked up a couple Heltec boards with tiny displays to tinker with, though haven't spent enough time there yet.

I've got a Lilygo T-Beam with a 18650 battery for backup power, an external battery, and a 3D printed case. It's fine for a stationary setup at home.

For more portable use, you might go with something like a Lilygo Meshtastic T-Echo.

https://www.ebay.com/itm/186858359561?mkcid=16&mkevt=1&mkrid...

Had one late last year, but had to return it because the firmware bricked within a few hours of use and no support was forthcoming. Wouldn't leap in just yet. The issue was triggered by running a repeater, whereas client-only use was fine.