I used this antenna to get OTA braodcasts in my basement. Although the product manual says that it will not work in basements, it worked just fine. I am about 20-30 miles from the towers.Terk HDTVa is the amplified version of HDTVi. Without the amplification, I received a snowy picture, but a crisp one with amplification. Only irritant is that you have to position the antenna and dipoles every time you change channels...