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I believe that you'll find that many older cable installations often have trouble with getting a clear signal on the low-band VHF channels (channels 2-6). This is a cable TV issue, and should be remedied by your cable TV company, as it is usually the result of deteriorating cable TV equipment, and is not your fault.
You are close enough to the GTA transmitters that you should receive a perfect picture on all of the GTA transmitters with a properly installed antenna. The situation is a bit different in Canada than is it in the US, where the US' conversion to digital broadcasting is complete, and Canada will not complete it's conversion until August 31, 2011, so Toronto still has a couple of analog-only stations, however most of the over-the-air stations in GTA operate a digital transmitter in addition to an analog transmitter.
While it is true that an attic mounted antenna may suffice for the GTA transmitters, it is much less likely that you will see the Buffalo stations using an attic mounting. As an alternative to using a rotator, you might want to consider using a roof-mounted 2- antenna system, consisting of a deep fringe UHF antenna aimed at the Buffalo transmitters, and a much smaller all-channel antenna aimed at the GTA transmitters.
Run separate coax cables from each antenna to a central location in your attic or basement, then use 2-2 way splitters to split the signal from each antenna into two cables, then run one of each cable to both TV locations in your house.
Use a simple A/B switch at each TV set to select between the GTA antenna and the Buffalo antenna. This will avoid having a rotator freeze up on you in the winter months, and will provide you with consistant year-round reception. I would use a Winegard HD-7694P aimed at the CN tower, and use an AntennasDirect XG-91 aimed at Buffalo.
Such an installations should future-proof your installation, and provide you many years of viewing for minimal investment. Good Luck.
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