HT charger is a possibility, but I've never seen one of the Town guys with one. Once the weather gets better (that's to say, the damn sn*w melts!) I'll slap some batteries in my DX398 and walk around.
I haven't seen any houses in the area with solar panels on the roof. However, come to think of it, they just installed a roof-full at the local school to power the hydroponics lab, so that's another possibility. Still, that's quite a distance (nearly a city block). Would the charge controller radiate that far? The twin sloper is broadside to the school, so just maybe you've hit it.
And I guess that puts the kabash on the solar charging system I was thinking of installing here... :(
One day I'll try to record the noise and post a clip here. It's hard to describe, but if you can hear it maybe it'll ring a bell with someone.
America needs a sense of humor...