Nutty, wild, possibly illegal but bold idea: TV channel change prank
High output IR light/beacon
Cable tv remote or equivalent code sender
High altitude urban viewpoint
The basic scheme is to send out a high output IR signal from this beacon to cable boxes to switch channels . The signal would be bright enough to reflect into any facing windows and reach the cable box IR receiver. It might hopefully affect tv's within a radius of a mile? Or more!
If performed at a certain appointed time, say, at the beginning of the Super Bowl, to tune in to, say, the History Channel, it's possible the effect will show up in the Neilson ratings as a momentary blip, before annoyed football fans switch their tv's back.
Guerrilla social mischief. If successful.