I'm in Louisville also. Squareshooter did not work for me. Now using a Winegard HD9095P (no amp) and have NO problems with OTA reception. My signals on each receiver is a constant 100. Your signal drops indicate a multipath problem.
I was wondering about that. The walls inside my family room are made of plaster and the big window is facing away from the towers. Its a big window tho... probably 12x8 feet. So there could be all kinds of bouncing off the walls here. If this is a likely possibly for the problem I would think E* would tell people that. They must still fix it on their end. But if a better antenna will solve the problem, why wait for them?