Thank you for the edit.
I do see a building in the signal path, which would account for the different azimuth. The signals try to sneak around and through as best they can.
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How do I find out where the best reflection is?. Is it just via trial and error?.
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Yes
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I guess I have to place the antenna at different locations and monitor the signal quality/strength?
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Exactly
I have been making tests with an indoor antenna and have found that antenna placement is very critical because of the reflections that make hot spots and cold spots.
I'm using a GE attic antenna indoors on the ground floor with buildings and trees in the signal path. My report is similar to yours but of course the signals are much weaker inside. I have a VHF-High channel 13 that has a listed strength almost as strong as the UHF channels, but the GE antenna has much less gain for VHF because it is just a folded dipole for VHF-High; UHF is a 4-element beam.
I use the Diagnostics Screen of my Sony to monitor signal strength, SNR, and uncorrected errors. Notes and picture of antenna added.
I calibrated the signal strength scale with my signal level meter, so I know what the readings mean.