For a short time in the 1970's we had a flying field on one end of park property where there were cross country high tension lines. The circle was maybe 150' from the nearest line but EVERY time you passed on that side of the circle you would get shocked. I suspect that the model flying through the surrounding magnetic field made the pilot the ground in a huge glow powered generator. We now fly in a much nicer park here in Omaha....
Bob