Ron Hardin wrote:

There's some huge heterodyne 380 Hz off 660 KHz in Central Ohio.

Probably something very local. I heard something similar the other day
while driving to work (I think I was listening to WFAN 660 as a matter
of fact). After driving a couple of blocks the heterodyne faded out.
The het I heard was a more like 1,000 Hz.

Art on LI