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The Toronto and Buffalo stations are spread apart by approximately 80 degrees. The main beam pattern for the 4228HD is roughly 60 degrees wide in UHF. If you have the antenna pointed at Buffalo, then it's no surprise that some of the Toronto stations (with NM around 0 to -10) are not getting picked up because they are outside the main lobe of the antenna pattern.
If you add an antenna rotator, you could point the antenna at each station for optimum signal each time you want to watch it.
You can also use two fixed antennas, two coax lines, and an A-B switch to capture both markets.
A third option is to use two antenna and combine them onto a single feed. This avoids the need to touch anything when switching between stations from the two metros. However, the down side to this approach is that the performance (gain) of the antenna decreases when you do this and you may end up with less sensitivity than you had before. Whenever multiple antennas are wired together like this, they effectively act like one large antenna whose radiation pattern is no longer optimized for a single direction.
Since the weakest stations you are interested in have pretty low noise margins, then a single antenna with a rotator would probably give you the best reception on every station. You just need to adjust the rotator position from time to time depending on which stations you want to watch.
If you want to go with the 2 combined antenna approach (so that you never need to adjust the antenna), then you will probably have less reliability on the weakest stations.
A pre-amp might not work in this situation due to the very strong local analog stations. The analog signals are strong enough to cause overload on most amps if you have the antenna pointed in their direction. An overloaded amp creates distortion in the signal and can end up making your situation worse rather than better.
When all of the transmitters have been switched to digital, the overall signal power in the air will be much lower than it is today (digital TV is much more efficient than analog TV in terms of RF power), so a pre-amp will probably be much more effective after the analog stations are gone.
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