I disagree with Shonky. I don't think it's a bad antenna connection. It sounds like bad wiring between the empeg and the tuner, or a bad tuner.

Double check that you haven't lost any wiring connections between the tuner and the empeg, then start going down the "bad tuner module" diagnosis road. Heck, I'd just say send Stu the module right now. Or, if you happen to know a local empegger, have them bring over their module for a test swap.