I'm not sure which Canadian HD stations are broadcasting at 1080i except for CBC and SRCHE, appear to be and keep an eye on Bell so they dont' downgrade to 720p. According to this poster on post #287, the rest of the signals Bell uses are down converted to 720p which is against CRTC regulations. There is lots of good info in this thread and you may find what you are looking for if you wade through it. The best uncorrupted HD signal will either come Over The Air or on a Free Too Air big dish. I think someone in Toronto receiving OTA signals could get a readout on their TV as too the signal.
http://www.digitalhome.ca/forum/show...=72525&page=20