So, for anyone who cares, here's my update in my adventures with OTA reception and antennas:
Before going to the trouble of mounting an outdoor antenna, I decided to try out some candidates in my attic first, where it would be easier to swap out and adjust antenna. I took one of the coax cables off of my unused sat dish and pulled it back into the attic - first attaching it to an old double bow-tie antenna (and indoor model that I used up until a few year ago.) I then used that line to feed five of my TV's (secondary viewing) and used the line from my Winegard Sharpshooter exclusive for the Tivo (primary viewing). With no longer splitting the the signal from the Winegard, my reception improved a little bit on every channel on the Tivo - but I was still experiencing some signal loss on a couple of the UHF channels, which varied with weather conditions. The signal strength also improved on some channels for the TV's attached to the bowtie antenna in the attic - but one or two channels - including a VHF channel were not coming in at all.
Next I made a trip to the Home Depot and bought the Winegard Free Vision antenna. I attached an old broom stick to a board with a screw, and used it for a base to attach the antenna. I put that in the attic, replacing the bowtie antenna. I had high hopes but ended up disappointed. VHF reception improved, but some of the UHF channels that I got with the other antennas did not come in at all on the Free Vision. Fortunately, it was easy to take down, put back in the box and return to HD. I then started looking at what else was available to buy locally - figuring it would be easier to return if it didn't work. I tried Radio Shack, but inventory is really spotty at the Shack these days, and I couldn't find anything that I thought would do the job at a price that was reasonable. That's when I ended up at Walmart and bought the General Electric Attic Mount antenna. Unlike the Free Vision, this thing arrives in a couple dozen pieces and take about 20-minutes to assemble. Fortunately, I have not had to return it, because it's working great. I now have it connected to the Tivo, and the Winegard Sharpshooter is serving the secondary TV's. I'm getting a strong signal on all of my local channels - with just occasional break-up on the UHF Fox station (I think that mostly happens when it's raining and the leaves on the trees are wet.) Every other station has been rock steady. The antenna claims a range of 60-miles, which I think is overly optimistic. I was able to get a measurable signal from the VHF (Channel 9) station in Steubenville, Ohio, which is 42 miles away, but it was completely unwatchable. But for the money (about $35) I'm pretty impressed with the GE antenna and I'm even considering getting a second one just to feed the secondary TV's.