OK, Roy. Here's another far out guess.

Back in the late '40s I remember chiropractors using a "diathermy"
machine. I believe this would use RF energy to induce heat in the
patient's muscles. We got a TV set in 1948 and started getting lots of
interference which was subsequently traced to the diathermy machine in
town about 1 half mile away. I never saw it, but I understand it was
impressive and would have been admired by Frankenstein.

http://www.medtronic.com/activa/phys...my_safety.html