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OK. I'll take it that the antenna looks through the asphalt roof and not through anything metal.
Smart phone compasses are not usually reliable. It's best to get a $5 compass at Walmart or a sporting goods store. However, an easy experiment is to aim it where you get PBS strongly but loose one or more of the others and then move the antenna a little at a time towards the the other stations. You might find a sweet spot. If it's easy to do, move the antenna up the pole a few inches. If it's already as high as it can go in the attic then try moving it down a few inches. Basically it's trial and error.
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