I thought about that too, and just tried to DX 580 now, and was hearing at least two stations in there, UFO talk was one one, so I guess it's George, since it's after midnight. I'm just outside of their blue circle on Radio-Locator, and if they were in circular pattern it would seem I'd have them as the dominant signal here.
580 has always been an empty frequency here by day, and I wonder if I really tried, if I could get them, in the daytime. I have a good signal on 570 from Youngstown OH and weaker on 590 from Uniontown PA, and 580 is a hole. I'll have to try it in the day and see what I get. I have to do any serious DXing from out in the yard, with more interference on AM, but it's always been better pickup in the yard with a Superadio.
Boomer