I live in the High Park area of Toronto and have a YA6713 for VHF-HI. When CHCH switched to 11, there wasnt much difference for me - about the same signal strength as prior to the switchover - strong enough I never have to point the antenna anywhere near Hamilton.

I am only posting this to show it is possible to receive CHCH in Toronto (maybe only the west side of Toronto). I would love CHCH to increase their signal strength as well (along with almost every other channel).