This is a total scam, the best way to receive HDTV over the air is to have an external antenna, even an older one works, I have a 1980's Channel Master with rotor box and a small amplifier and I receive all Chicago and Milwaukee over the air channels, do not buy cheap indoor antenna's. They are not worth it, and if you do buy local from Walmart or the local hardware store, or for the online people, amazon had plenty outdoor and indoor. And if you still have your old antenna on the house, all you may need is to upgrade the cabling to Quad shielded Coax.
Bottom Line: No, I would not recommend this to a friend