IMO, you want an antenna that can get VHF too for those channels like real 9 & 10; the DB4e is basically UHF only. I'd check into a Winegard HD7696p or similar instead. You'll want to aim it at 221 deg.
The quad RG-6 sounds like overkill unless you have a spool in the garage already. I don't think quad will help with signal loss as the core is the same; it just offers better resistance to interference. But it can't hurt if you really want that.
You may need a pre-amp but you can wait to see how it goes w/o it, as they're easy enough to add afterwards.
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