I'm finally getting a clue and posting this here. Oops?
I've since sent a reception report to the station and heard back that, because of limits in place set to avoid drowning out U.S. stations, CHAM shouldn't have been heard here. That's a real shame, IMO, and seems a bit unfair. ... I'll stay off my soapbox and just post my log. The engineer who answered my message was quite nice about things, and verified my report besides.
Heard in Madison, Wisconsin:
820, CHAM Hamilton, Ontario, 0514-0520. Country music at tune-in, then a clear spoken station ID including location information, before back into music. Good signal, trading places with WBAP in Dallas.
No offense to anyone in Dallas-Fort Worth, but I'd rather have the Canadian signal!