posted on Mar, 14 2016 @ 02:20 PM
There is a booklet published in Europe around 1985, entitled "Radio Is My Bomb". It discusses pirate FM radio. The transmitters are not nearly as
difficult to construct as you might imagine.
A key benefit is that anyone within range and knowing the right frequency can hear you. Back in the Old Days, pirate broadcasters would plaster the
target area with handbills giving the time and date of the next broadcast. They'd then build a disposable transmitter, and place it difficult
terrain, along with the audio feed (on digital audio tape!!!). It would often take government authorities only seconds to triangulate they signal
source, but an hour or more to physically locate the transmitter. The authors described radio pirates in the UK who were able to place their
transmitters on the roof of an apartment building, and then add illegal locks to the access door. While "The Man" was trying to locate bolt-cutters,
pirates would climb up on the roof from a top floor and retrieve their equipment before the cops got it!!!
Imagine how much more could be done now, in the days of thumb-drives, when the audio file could be switched on an off by a remote control, and
broadcast one "show" from multiple locations.
All of this might seem pretty far afield from the OP's discussion of 2-way communication. But the system I am describing is exactly how government
spies use "numbers stations" to communicate with their spies in a foreign (enemy) state.
Basically, the "Base" needs to be outside of government jurisdiction, or somewhere they cannot reach to stop the broadcast. The man in the field can
use another form of communication, and the answers are broadcast over FM in code. You don't need to know the field-spy's location, in order to direct
him. And if you are using a "one-time pad" means of encryption, your broadcast is unbreakable.