First, this product did what I wanted it to do, which is to give me all my local TV channels, as well as the national ones. Now, specific details. I have a TV tuner card in my computer, which I bought quite a while ago. It came running Windows 8 (the latest at that time) which had a feature called Windows Media Center which allowed me to watch regular broadcast TV on my computer. Well, I made the mistake of updating to Windows 10 which eliminated the Media Center. I finally found a program call MediaPortal which once again allows me to use my TV tuner card and watch TV on my computer. I was using regular rabbit ear antennas to capture the broadcast signal, but with MediaPortal, I was unable to get all the local TV stations I was used to. I live in NYC. So for those of you who will be familiar with this, my rabbit ears did pick up the national stations CBS (2), NBC (4), ABC (7), (and their decimal point stations), and some local ones like Fox 5 and ION (31). So I had those. I was missing Channels 9.1 (WOR), 9.2, 9.3, 9.4, 11.1 (WPIX), 11.2, 11.3, 11.4, and 13 (PBS). These are all local stations, not national ones, but I wanted them. I first installed this new Vansky antenna without the amplification unit attached and I picked up the four 9s (in addition to all the stations the rabbit ears had picked up). So the Vansky alone gave me four additional channels over the rabbit ears. Then I decided to try it with the amplification unit attached and it added all the 11s and 13. Therefore, the amplification added five additional channels. (Just an aside: I plugged the amplification unit into a regular outlet; I did not plug the USB into my computer.) I now have a total of 38 broadcast channels. All the usual NYC channels: 2, 4, 5, 7, 9, 11, 13, and 31 (and their matching decimal point channels), plus a whole lot of other channels I am unfamiliar with. I am happy with this product because I got what I wanted, which was all the local broadcast stations I ought to be getting. I have to tell you honestly, that I did not play with trying multiple locations for the antenna. Perhaps if I positioned it on a different wall I might get even more channels. Or perhaps less. I know the direction the antenna faces matters, but I didn't do that. I simply placed the antenna as close to the ceiling as I could and directly above a window. I got all the stations I wanted, so I am more than satisfied. I hope the information I have provided is helpful to others.