Yes 98.5 is clear in Toronto.There is 98.5 from Kitchener.Buffalo stations with interference problems are 106.5,92.9,104.1,103.3,94.5,93.7,96.1,96.9.The 106.5 is totally blocked with Toronto station on same freq.
92.9 - closest adjacent is 93.1 Barrie. That shouldn't be a problem
93.7 - closest adjacent is 93.5 low power from Toronto, can be a definite problem
94.5 - closest adjacent is 94.7 Hamilton / Burlington. That could be problem
96.1 - closest adjacent is 96.3 Toronto (not CN Tower), had recently upped power (within the last year, now a powerhouse) that will definitly be a problem
96.9 - nothing adjacent on either 96.7 (Kitchener) or 97.1 (Belleville) that I know of. 97.3 is Toronto, but that's 400KHz alternate and shouldn't be a problem.
98.5 - Clear as you report, but note: 98.1 Toronto (CN Tower) is 400KHz alternate spacing... Me suspects other factors at play in the 96.9 problem.
103.3 - closest adjacents (2) are 102.9 Hamilton, 103.5 Toronto (or more precisely slightly north of Toronto) Both could be problems
104.1 - closest adjacent - 103.9 Toronto low power (deviation is set a touch high I notice which could aggravate things) 104.5 is Toronto CN Tower, but again, that's 400KHz adjacent
106.5 - Co-Channel - 106.5 Toronto. Receiver's capture ratio will take care of any chance of out of town signals. In case of an inversion (enhanced reception), in stereo (which technically has a much much lower capture ratio anyway) you'll hear additional distortion and background "racket" that follows the modulation patterns of the other (in this case) Buffalo station. That's why no-one is honest enough to even think of stating their stereo capture ratios...
The figures would look terrible. Not a fault, just inherent in the FM stereo mode of broadcast and reception technology.
You kinda got a long winded response, but to others who aren't in such a congested radio enviornment, which the corridor from Pickering through Toronto, to Hamilton is, and Toronto north to an extent, can place horrendous demands on even the best in tuner design. What was interesting is, back in '92 I took a trip to England, and took along a pocket AIWA thin FM radio. Here in the Hamilton - Toronto area, it overloaded a lot, but had good adjacent channel rejection. In England, it operated flawlessly, everywhere. They don't use anywhere as much power, and had good coverage. Here, the days of 100KW assignments are pretty much gone, except in northern or unpopulated areas that need a flame-thrower to cover a large geographic area. Lower powers allow more stations, with less coverage.