Just to follow up for the good of anyone else who is looking at this, I ended up installing an ANT-751 on my roof, and so far so good after a couple days. TiVo's antenna signal numbers went from in the 40's and 50's to the 60's and 70's (out of 100). This is with no real precise aiming as I chickened out and had a handy-man climb up there and risk his neck for a few bucks rather than mine. I didn't instruct him on the use of the compass since the signals improved so much with just a "point it that way" direction. After all, I am only 13 miles away.
Thanks to the community and everyone who answered my questions! And if anyone wants my old Winegard from the attic, I'll cut you a deal!
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