Then you are turning off one of the things that makes GTA what it is ;/
The radio stations are quality and hilarious have you heard the Rock station dude going on about religion? and then some random dude calls in and tells em to fuck religion cuz he has his guns then starts blowing the crap out of some people in the back ground?
IMO gta without the radio stations wouldn't be as good as it is.
Its great for a short while, but when you're playing a 30+ hour game it soon gets repetitive