Radio in Fallout 3 (Fallout 3)

I don’t know, maybe this topic has already been raised somewhere, but I didn’t find it, so I want to ask a separate one. There are many radio transmitters scattered across the wasteland, usually when they are turned on, different signals like "alpha-bravo", etc. appear. etc. Actually, the signals do not carry anything useful, an ordinary Morse code. But here are two questions, in fact, who knows what they can be for and what will happen if you turn on all the radio towers in the game?