I don't have any sophisticated metering equipment, but, at first blush, the 751 seems to do a good job indoors. The VHF channel I currently have comes in at around 75% signal strength on the cheap Insignia I used for testing -- better than some UHF channels that should be stronger. I think I could improve signal on everything I care about with a preamp enough to be pretty reliable. The only problem is WUNC (PBS) is in another direction. I am not concerned about not receiving it because it is close enough a spoon would probably work as an antenna for it. I am concerned the preamp will over-amplify its signal.
I'm going to see if I can figure out a good way to mount the 751 from in my attic this weekend, which should provide some challenges.