The NFL moniters (as everyone saw last night) every radio frequency in an NFL game, so unless you think that the Patriots were actually attaching tape recorders to defensive lineman (yeah, I think their is a large box on Seymour's back) this didn't happen either.
Those giant sideline microphones, the giant 3 foot round clear plastic things you see on the sidelines of everygame, can pick up the QB's calls, and with a little careful editing, you can get rid of the crowd noise (which is what Saban bought last year), but either way, it is not illegal, because it is part of the broadcast.
BB is paying the price for not cowtailing to the media, plain and simple. These media scumbags are trying to discredit him at every term, they are now just throwing everything they can think or dream up of at him. Ask yourself this question, if Tony Dungy, or a media whore like, Gruden, or somebody like that got caught, do you really think we would have heard half as much?