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My thinking was that all your target stations are exactly 180 degrees apart, and they're nicely divided by noise margin values into two contiguous blocks. A directional antenna would be ideal, but an omni would be more likely to allow multipath signals to come in too strong and possibly mess up a good thing. The attic would only make it worse, maybe much worse, so a directional antenna would be best in the attic, too. Better above the roof. And with such strong signals, you don't need a high-gain antenna, IMO, and I'd aim it at the weaker signals and let the stronger ones come in off the back.
I'm just an enthusiast, not an expert, so do listen to what GUM, teleview, towerguy, and a few others have to say.
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