alt Hacker NewsTrusted IPSec tunnels to form your own trusted internet of peers/friends within the internet. It's all just 'a LAN' then. I dunno how well that scales, but it's a lot easier than trying to sort out radio shenanigans (which in my experience are actually regularly enforced by FCC/your local equivalents).
That's been done a few times with Tinc (open source VPN) [1][2]. It's great until the group includes one bad apple. All it takes is one person with low impulse control, low opsec to bring the whole thing down. Some hacker groups did this some time ago.
[1] - https://www.tinc-vpn.org/
[2] - https://www.linode.com/docs/guides/how-to-set-up-tinc-peer-t...