Slightly off topic, but we did this cracking experiment when I was at college. Get a lightbulb, solder two tuned lengths of wire to it to act as an aerial, cut to the correct length for a local transmitter frequency. Drive up to the transmitter, and see when the bulb lights up....then carry on driving closer and see how close you can get before it burns out. Then do the math....if it can burn out a 25W bulb at this distance, and it has a roughly donut shaped transmission pattern, and it reduces by the 3rd power with distance, how much power is it transmitting?
(and how quickly should you get "outta there" before you have no skin left!!!)
We did something similar with "shielded" wire, just to see how effective shielding was, both inside equipment and from external receivers to equipment....result....most shielded cable is lower quality than it should be....and delicate electronic kit will go phutz just from the current induced in the grounding shield, forget about the signal wire!