Best part about a simple AM receiver is that it doesn't need a battery… For emergency situations it'd definitely be best as it's dead simple to construct, you can boost gain in radio station for more reach / power to the battery-less receivers, etc. and the transmitters are simple, too.
For emergencies it's also not a bad idea to have an offline copy of Wikipedia.
Best part about a simple AM receiver is that it doesn't need a battery… For emergency situations it'd definitely be best as it's dead simple to construct, you can boost gain in radio station for more reach / power to the battery-less receivers, etc. and the transmitters are simple, too.
For emergencies it's also not a bad idea to have an offline copy of Wikipedia.
Kiwix is great and Wikipedia is surprisingly small :).