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You will loose 10 dB relative to an outside antenna when "looking through" a roof with shingles. I determined this with extensive testing. In laymen's terms, the signal voltage is 25 percent of what it would be outside. If you could get the antenna nearer to a wooden wall facing the station, the signal will probably be better. If it is at all possible to try the same or similar antenna outside at the same height as the antenna in the attic to see if the signal is better than the signal in the attic. At least you will know if there is a problem in the attic, even if you cannot install the antenna outside, you will know if there is actually a problem with the attic equipment.
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