Rochester's digital stations are all broadcast from a single location. I've plotted it on my map, and unfortunantly Peterborough is about 90 miles away. While 90 miles is doable for Buffalo stations, Rochester's are all low power (except for PBS, which is "moderate").

16 PBS WXXI - 180 kw
28 FOX WUHF - 21.2 kw
45 CBS WROC - 1.74 kw (no HDTV yet either)
58 NBC WHEC - 38 kw
59 ABC WOKR - 8.7 kw

Buffalo's Grand Island is about the same distance away from you, the other Buffalo stations are up to 120 miles.