Hello A.E 352 and Steveo:

Ok that sounds like multi pathing to me! That is two or more signals of
the same station arriving at the different times to the receiver.

In FM its really bad.

I once bought a FM Broadcast Band Directional Beam Antenna. I wanted to
hear a FM Station over the hills in Santa Monica. It was KNAC heavy Rock
n Roll Station, that no one could hear.

I installed a mast next to the side of the front of the house. And
pointed the beam towards Santa Monica to hear KNAC. I could hear several
stations on the same frequency and a lot of distortion. After turning
the beam away from the Santa Monica, and towards the mountains behind my
house KNAC came in loud and clear, and full quieting, even had the
"Stereo" Light come on. But station was a disappointment.

http://www.qsl.net/n9zia/wireless/multipath.html

But I did learn about multi path.

I wonder if the radio signals are bouncing off the Aurora and having
multipath?

I know I have heard local power stations have their signal bounce off a
local atmosphere, causing back scatter, and those signals wernt strong
enough to miltipath. I think.

Jay in the Mojave

Steveo wrote:

It made stations sound warbled sorta like when someone has a low power
supply behind their transmitter.