We added a second HDTV to the household and decided to try an off-air antenna before connecting to the pre-existing cable. Purchased the Terk HDTVa and the Antenna Direct Clearstream 2. The Terk HDTVa did nothing - absolutely no difference in reception between the TV without an antenna and the reception with the Terk. By contrast, the Antenna Direct Clearstream 2 produced better-than-cable quality video. In fairness to the Terk, the transmitters in our area are at the limit of its stated reception - 40 to 45 miles; also the Clearstream is a somewhat more expensive antenna and was given about an 8 foot elevation advantage (attic) over the Terk. Still, the Terk was highly disappointing and I do not recommend it.