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My neighbor found out the hard way that he has foil back insulation under the vinyl siding, which blocked nearly all TV signals. He found joy by moving the antenna so it was 'looking' through the roof, but even with a report similar to yours at my location, I've found that something with higher gain than rabbit ears is needed in my attic. Rabbit ears actually work better at ground level here instead of in the attic.
Says nothing about your situation, though, other than it's possible there's more blocking and/or reflecting your signals than is apparent.
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