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We like roof mounts here but that's not always possible. So consider that there will be a reduced signal as well as some multipath with the attic mount. The roof materials will matter too. Any metal, foil, etc will be a factor to contend with. If you can test the antenna in the attic, go for it. Worst thing is that it doesn't work and you have to look into the roof mount instead. Antennas like a clear view in the direction of the tower.
That said, I'd think that something like a Winegard 7694p would be fine on the roof, so I'd go bigger in the attic, with a 7696p instead. You'd aim just left of north based on your report. Channel 17 may come in on the backside since it's closer to you.
I'd test that out connected directly to one tuner. You can use the HDHR or a TV to test signal strengths. Once that looks good, then work on splitting it out. A splitter will create losses, which you may then need to install a pre-amp to make up for those losses.
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