Yes. We think about it in terms of longitudes. When you think about that portion of the geostationary arc over Canada, it's probably the case that any geostationary satellite in the portion of the arc located between 65 degrees west longitude on the eastern side and probably, call it, 130 degrees west longitude can see all of Canada.
Ideally, you want to be over the middle, because the further out to one side you are.... Just picture the satellite up in the sky way over the east; if you're all the way out at the Queen Charlotte Islands, your dish is going to be more or less looking at the horizon. Ideally the satellite is right above the dish, so that there are no line-of-sight pointing issues and the like.