Worst case scenario isn't as far away as you might think. Consider that the FCC is pretty good at winning the cat-and-mouse game against pirate radio broadcasters. And those are people who can change their locations at will.
How long do you think it would take to go from the power company noticing an anomaly to someone walking down the street with equipment to detect the source? A week, maybe? There's money at stake, and these aren't stupid people.
Also not a very hard thing to investigate and track down for someone who is interested. I think a good portion of the readers here can design the equipment to do that.
