I just spent the day with a VX91 so I can give a first hand report. I live 20 miles from Binghamton, NY and get two high band VHF stations reliably using a large dedicated high band VHF antenna. I can even pull in some Scranton, PA high band VHF stations (90 miles away but with less hill blockage) if I swing the antenna around, though not as reliably.
I had hoped the UHF only VX91 would work for the UHF stations in Binghamton. I spent the day cutting trees, moving the antenna to a clear location and raising it as high as I could. All of that didn't even get me a wiggle on the signal meter on my Panasonic TV. It was as if there was no antenna connected. Ditto for Scranton and Syracuse (also about 90 miles away). I don't think a pre amp would help since there seems to be nothing to amplify.
So I now have about $100 in new antenna and RG6 sitting in the basement.
My goal was to get a PBS station in HD so I could drop my basic cable. Since I can't record the stations I get from cable I tend to not watch them, instead recording the ugly SD version from Dish. That is a waste of $20/month.
Did you order from Antennasdirect.com? They allow returns.
For the Comcast HSI lite, the price is again only for subscribers of other services, and it is 1.5mbps, NOT 1.5MBps, which is what their normal tier is. 1.5mbps is too slow for many users, as it won't allow any decent sized file downloads to happen in a reasonable amount of time, and it won't allow streaming of HD video.