With 70 degrees between channel 11 and 7, I would try aiming to the exact location of each. Channel 11 at 97 degrees and 7 at 29 degrees magnetic to determine if your problem is FM interferrence, UHF antenna, or dirrection.
If the problem goes away with dirrection changes, You may want to go with another antenna and amplifier set-up.
Let me know.
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