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I did a generic TV Fool Map for postal code M3A2H1, using no address. The results for 20 feet were not hugely different for WGRZ than your plot:
10 ft = 6.0
20 ft = 8.7
30 ft = 11.5
35 ft = 13.1
40 ft = 14.7
Notice how the signal strength gets better the higher you go. If your roof antenna is 20 above ground than it is likely on a short pole on the roof. You might consider using a longer pole.
That said, I agree with Rabbit. If I were you, the first experiment I would try would be to aim both panels of your 8 bay antenna at 162 degrees (measured with a real compass) and don't touch anything else. While the antenna is aimed at 162 degrees I would check and record the signal strength shown on your tv screen for each channel you receive (assuming your tv displays them). Then post that information here. Each 8 bay antenna has different specs, but I imagine yours would have some decent reception at 45 degrees in either direction of where it is aimed at (for the Toronto stations). It's certainly an easy experiment.
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