Which protocol are we talking about?
http://gsc.us.com/products.html don't seem to mention what they're using...
I do agree that the extra audio component makes it
unlikely. And if not for the Pats' expertise in the fields of subterfuge and radio engineering, I'd dismiss it out of hand. As it is, I think it's hard to believe that they'd intentionally do this in a week one game, so it's probably just an equipment screw up.
But if the question is, is it possible, then ... I don't see why not? We're talking about a hack. Are hacks possible? Always.