My review will not praise this units ability to improve your signal. As others have already stated, this little amp works extremely well. I have installed hundreds of these over the years with varying success. I do not work for this company and have not purchased from them before. I have a degree in electronics and have worked in the industry on and off for years. Here are some items that may help you decide if you even need this or a similar item. I just installed this on my personal system with great success.My system consists of the following:1- 20 plus year old roof top UHF/VHF antenna that was on the home when purchased2- 8 way splitter used to send to 6 different areas3- 7 TV's attached and operational WITHOUT amplifying4- 2 TVs are SD with a converter box attachedI have uploaded photos of the system in customers images area I hope they are there!Questions I always seem to get ask about these items and antenna systems for HDTV in general......Q: I called a local antenna installer and he told me I need a new and very expensive antenna to receive HD broadcast TV. He stated that the old one on my roof cannot possibly work.A: That may not necessarily be true. In some cases old antennas (20 years old & older) may work very well depending on their design. My personal situation consists of a 20 year old antenna that is working extremely well.Q: You are saying that my old antenna may work, but how do I tell if it will work.A: Simple answer is, try it and see. But make sure that your current antenna has RG6 running from the antenna to your test TV. If it has 300 OHM twin lead (flat lead/black or brown) it must be replaced with a tiny transformer at the antennas connections that will permit RG6 to be connected from that point to the TV. The 300 OHM twin lead, if used, would act like a magnet to stray noise. For example, you may be able to tell when your neighbor starts that old truck he owns. (electrical noise)Q: OK, I have all that and it connected to my TV, now what?A: Turn on your TV and enter the Setup area. Locate the setting that indicates the type of signal you are connecting to your TV. Make sure that it is set to Air or Antenna before you do a scan. If it is set to another type of input, your scan will fail. Now locate "scan" or "scan for channels" to begin your scan. Allow it to complete then it will generally go to the first channel in your area. (lowest channel number like 2-1 ect.)Q: OK, I have 19 channels, but how do I know how many I should have?A: Use a service such as TitanTV where you can enter an area code. This well display all the HDTV and SDTV channels in your area. If you live in a country that is not covered, Google (do a search) for a service that will display the channels in your area.Q: There are 24 channels where I live, how do I get the remaining channels.A: Here is where it gets tricky. Most TV's have a signal strength indicator. Some are in the Setup area while others are visible for each channel. I have one that shows in the EPG (electronic program guide) and indicates as a percent of the signal. My best signal for my best channel was around 83%. It varied from there to less than 30% on really weak channels. Look carefully at the picture and find a dark area near black. If that area appears to be made of squares with lots of changing little patterns, the signal is noisy. All though the picture appeared to be fairly good on my 83% channels, the black areas were a checker board. My poor signals 30%, were really full of artifacts and noise. I decided that I had a signal that could be successfully amplified. Had I found that my highest signal was around 30% then I would have called around and found a new antenna. IMPORTANT remember, this device amplifies your signal and can make the situation worse by amplifying the bad parts as well as the clean signals. It cannot create a good signal, only make better a fairly good signal.Q: I noticed that these devices have a dB rating. It states 15dB (32x) signal boost. There are other available that have a much higher dB rating. So if I purchase a 32dB device and use it, that will make up for my crappy old TV antenna, right?A: Remember what I said, amplifying a poor signal can make it worse because it also amps up the noise and clutter in the picture. Something else to consider is feeding too great a signal to your tuner can cause even more problems with lockout and other malfunctions. Also, this device CANNOT create a signal, just amp up a good signal.Q: You say that your have 7 TVs connected to that old antenna. How long are the RG6 runs to the TV's?A: The shortest run is to my shop on the lower floor. Its around 40 ft to the TV which uses a converter box. The longest run is about 120 ft to the TV in the living room which is a 42 in HDTV. All TV have 100% signal after installing this device.Q: How far is it to the Transmitting tower/s that broadcast the signal?A: I live North of the major city where the towers are. Line of site to the towers where all signals come from is around 30 miles or more.Q: I want to use this on a converter box that I have attached to my older SD TV, will that work?A: Simple answer is YES....... simply consider the TV with the converter box attached as a HDTV with the tuner on the outside....You are not using the internal tuner when using a Down Converter unless it is attached as channel 3-4 which uses the RF signal from the converter box. Always use the red/white/yellow cables if possible as RF can be noisy. (sparkles and blotches in picture)Q: So after the Signal Booster was attached, what improvements did you see?A: All signals were dramatically improved. Those that were around 80% are now 100% and black areas were clean. The lowest channel at 30% now is around 74% and I have 3 new channels with lousy pictures that are low power Local Spanish channelsQ: If I purchase one of these can I be guaranteed the same success?A: I would never make a statement that all purchases of this or similar items would produce the exact results. There are simply too many things that can alter the results. Country that you are in, or terrain or how your antenna is oriented can make a huge different. As an example, 4 years ago I purchased an antenna that rotated and had a range of over 100 miles. It was from a very big internet site and I thought I would take the antenna down from the roof and install this wonderful device in my attic on the third floor. After several months of rotating and tuning the antenna it stopped turning. My signal at best was around 60% and full of artifacts. This was a $60.00 lesson well learned. I had wired the home when installing this antenna so I simply attached the old rooftop antenna to the wiring. You know the rest of the story.Thanks for taking your time to read this. I hope it helps someone with their HDTV problemsNote: I had Comcast, DirectTV, Dish Network and now have HS internet and over the air TVIf you have splitters that remained on your home after they took down their equipment, use the splitters. They are excellent splitters for HDTV from your antennas. See my photos of the system.