Having something like this http://en.wikipedia.org/wiki/Family_Radio_Service , and just have 10 channels (some have more, but do we really need that many?). They have a max range of about 5 miles. Anyone can tune in, so that's the catch, but would be cool to implement. The fact that almost everyone uses TS or vent though... But these are plentiful and need batteries, which could be a new resource to scavenge/fight over!