Well I've had some success so far, I think I picked up Radio Havana Cuba last night. Is it possible that since I put the receiver in a plastic enclosure it might be able to feedback with my loop antenna? Perhaps the local oscillation in the receiver is picked up by the antenna and fed back into the receiver. There is a lot of squealing at some points even with the regen just barely set into oscillation. Oddly, the antenna attenuation switch seems to have no effect, I should probably check to make sure I wired it correctly.