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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.

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