Sounds like having relatively high bandwidth won't be a problem. Isn't bandwidth available a bit arbitrary any way? Shouldn't my device just be able to communicate anywhere in the spectrum with handlers for all legacy protocols?
The issue is routing. HF Amateur radio as used for emergency purposes routes by manual re-copying of messages between an ad-hoc network of stations. This is basically WWII technology. Works OK, but very limited traffic capacity.
There are VHF repeater chains, AX-25, and other fancier ham infrastructure, but if that's up and running, the cellular network is probably up, too.
The next ARRL Field Day is June 25-26. This is supposed to be practice for emergency communications, but it's really just a DX contest. Everybody just tries to contact other stations at random; there's no attempt to set up a net.
You'll see antennas in parking lots. Visit the people there and see what they're up to.
