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(I know that signal strength is not the indicator of whether you get the channel coming in or not - Signal Quality actually is. Signal Quality is the ratio of Signal Strength vs background noise). I wonder if the channels that are so close on the CN tower are affecting some of these Buffalo channels by creating a large noise floor thus reducing the Buffalo Signal Quality?)
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You are quite correct, the overwhelming power of the signals from the close stations will make it difficult to receive weaker signals. The exact effect of these strong signals will vary from one tuner/receiver design to another.
A common effect of excessive signal levels will be that the circuitry inside the tuner will be forced into non-linear operation, (signals will be distorted) this results in separate frequencies being mixed together which generates sum and difference signals. If the distortion-generated-signals are in the same channel with a desired signal, the signal to noise ratio will be reduced.
Notice on your TV Fool report, the column Signal:Pwr(dBm); Eight signals are flagged in red, indicating they are likely to cause overloading of your receiver. This is not a guaranty that you will have trouble, but many receivers will.
An attenuator may help, but there is not much margin to work with... as you reduce the signal power of the strong stations, a simple attenuator will reduce the power of the weak stations also. With 15 dB of attenuation, the weak WGRZ signal will likely be on the edge, if not over.
TinLee.com may have some products that could attenuate individual channels... $$$$????