"Syracuse, Buffalo, and Utica have some fairly high terrain near their respective urbanized areas -- but from Rochester, the closest land exceeding 1000 feet AMSL is on the Ontario County line: http://www.cohp.org/ny/Monroe_1.html
This may explain why Pinnacle Hill became the primary local antenna farm, not to mention that it casts a shadow on signals transmitted from the south. With Pinnacle so close to the market's center of population, there is less need for "superpower" than in a situation like WAMC's, WNED's, or WNTQ's."
One thing I wonder, though...back in 1952, when the revised rules for TV stations went into effect, Baker Hill (that high point on the Ontario/Monroe line) was still only about 10 air miles from downtown Rochester, quite a bit closer than the 17 mile trip signals have to take from Colden (Ch. 4 & 7) or South Wales (Ch. 2) to downtown Buffalo. Had someone decided to put an 800 foot tower on Baker Hill on either side of the county line back in 1952 it would have been an ideal site for the market's TV and FM signals and given them all full power at a full 1000 feet above average terrain--not to mention enough height to clear any natural or man-made obstacle in the way of full metro coverage. The area was nearly unpopulated so the likelihood of a NIMBY problem like the one that delayed the building of the Pinnacle Hill tower farm for a good 18 months in 1947-49 (and maybe delayed a second TV station in Rochester for five years) was nil. It also would have made the engineering of all the Rochester stations a bit easier since 13 on Pinnacle Hill is a hair's breadth from being short-spaced to Kitchener/Waterloo, while on Baker Hill there'd be plenty of margin for error.
The other Rochester TV stations would be properly spaced from either site. And FMs could have been built at much higher power, and fit within even current spacing requirements.