Ed, is there absolutely no way to go outside with it? You could even try something like square shooter. Its not very big and can blend in well, maybe even be able to paint it.
Ive been told that you lose almost 50% signal right off the bat in the attic so it would be a test. Jim is the one to explain the basics and what might work since he is in your neck of the woods.
I have a friend here in Statesboro that I gave my old channel master wing looking antenna. I mounted it in the attic and he is barley scraping by with a 60% or so signal on a Dish 811. I will help in any way I can though.
This is the one that I gave my friend