I'm one of the 1.7 million people currently coding a survival game set in a zombie-infested post-apocalyptic world. I'm thinking of adding some kind of a radio system to the game but unfortunately I don't have any expertise in the field of radio transmissions and frequencies, so I'm looking for some help. I'm not aiming for ultra realism, but it would be nice to make everything at least remotely realistic. Maybe there's a radio amateur lurking in the forum who could give me some pointers.
My idea is that the player can find some kind of a battery-run radio receiver and try to listen to different frequencies. There would be some kind of a "government" frequency, some more local S.O.S. signals etc. and maybe even a rogue radio station of some kind. Being able to hear different signals would depend strongly on player's position and his altitude.
Which set of radio frequencies would likely be used in a situation where the civilization has collapsed? What kind of gadgets and technology would transmitting/receiving require? Any relative information and ideas are much appreciated.
(edit: I'm sorry if this is not the right sub-forum! Feel free to move it.)