Hacking a handheld radio should let you listen in to every frequency.

[Carbadox]

I don't believe this to be that game breaking since for one, listening in to frequencies isn't a weapon, it's only an asset. Not to mention that it can't be worn, it takes up an inventory space and any intercepted messages aren't spoken into your ear but are on a speaker so it makes it extremely obvious when you're in a corridor with someone who's listening in. I do agree that it might be too easy but emagging seems a bit dumb when you could just go emag a locker to get an actual headset.