Ah, that clears things up.
Radio block would be more effective in my eyes(or ears).
I also wondered about the enemy suddenly talking in my ear, clear as a day, but now I know. Any way to "corrupt" those enemy radio messages to simulate that it's an interference? Or crank the radius down to 20-30 meters and have positional audio so you can hear where it's coming from?
All in all good intentions, but I sadly don't like it.