The use of radio has other applications as well for preppers. I prefer non-license Citizens Band (FMRS/GMRS/old Class "A", and Class D/11 Meters/40-channel CB). No paper handle or license for them to get hold of.
There are lots of people learning the basics of shortwave listening these days, often paying more for transceivers just so they have transmitting capability if they ever really need it.
Check out the AR15.com "Outdoors" forum and Ham radio subforum. Those guys have an downloadable SHTF frequency list that they've developed.