A pwerline runs thru my uncle's farm,and according to him, it's a 138KV line..in junior high, I found out just standing under the lines with a fluorescent tube will cause the tube to light up dimly,with "waves" of light travelling up the tube from where you grip the tube.Weather greatly affected the effect, a cold night with a light snow being best. Also, the was a 180+ volt potential between his barn roof and ground.( the power company grounded the roof for him). Anyone else out there ever try something similar? I'd considered winding a coil and connecting it to a AC voltmeter to map out the magnetic field, bit I've heard such a coil could land you in trouble as a "illegal tap"(you are,in effect, making a secondary coil of a transformer.)Just curious.