What's in there with 1100 WTAM in the evenings?

For better than two weeks now, I've noticed something about +/-10Hz off FREQ battling it out with Cleveland's 1100 WTAM on a job site to site drive at 10:06PM EST, (When I want to catch the opening of Ground Zero Radio with Clyde Lewis.), and also still there on the drive home, like after 2AM, when I want to see what's on C2C AM. So, what is that? You'd think that 1100kHz would have Clear Channel to WV, but I'm now nightly hearing something in there with it. Any ideas???