I have little interest in the subject, but I do have a related short story...
We were at LBL last year where we met a nice couple in the next site.
He had an interest in Ham Radio and was setting up to use his.
He had a really neat device which shot a cord carrying the antenna way up into the trees, so he could transmit.He gave me a brief explanation and we parted company for the evening. Everything went well for the evening and we shut everything down and settled in for the night.
has remote speakers attached to the television and sound system. All power was off!
I was shocked to consciousness in the dark by a strange loud voice just above my head, it had a sort of odd electronic accent which enhanced the eerie nature of the whole experience. Once I got my breath and sensibilities back in order, I realized what was happening....
The neighbor was broadcasting with enough power to induce a current into my speakers and made them act as receivers. He was speaking loud and clear from the cupboards over my head eventhough the speakers were off and had no onboard power supplied to them.