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It sounds like you're after WXIA (NBC, real channel 10), WGCL (CBS, real 19) and WAGA (Fox, real 27). All around 238-degrees magnetic. Is this correct? If so, you'll need something with VHF-Hi elements for the WXIA, and UHF elements for the others. The Winegard 7694P might be enough antenna for you. Another recommendation is the Denny Stacker. Since it has a smaller footprint, it might fit better in the attic and is also more powerful. Shingles, sheathing, and rafters attenuate signals, so you might need to mount it outside, especially if trees are nearby. Your signals are moderately strong, so you may be ok in the attic. Suck and see. But if you have a metal roof, I think you can forget about an attic install.
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