"I've talked with no power, the radio wasn't even on."
Back in the early 70's...
on good old 23 channel cb..
I used to get contact on my radio..even when it was off..
I was dumb founded at it for a bit...
but then realized my friend who was splashing over my off radio..did so simply because the bottom of his antenna was maybe 4 ft from the top of mine..lol
We lived in an apartment building...he was on 5th floor and i was on 3rd floor..
both out antennas were sticking out the window ( i was using some type of car antenna screwed into the window frame...while my friend was using sort of a big stick type antenna..but instead of bottom fed it was center fed )
Those were good times though....LOL