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Another factor to consider - possible co-channel interference from WTVX. Tropospheric enhancement is fairly common down your way, so it's entirely possible that as you aim the main lobe of the antenna at WUSF, you're picking up enough interference from WTVX to knock it out. Aiming the antenna at 15 degrees is probably putting a null towards WTVX while having enough sensitivity towards WUSF to pull it in.
Stranger things have happened.
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