I have no problem installing this but I have been in electronics for 40 years. I like that the inside antenna has VHF connectors on the cable. It is also long enough to put the indoor antenna a good distance from the amplifier. Some of these units only have about six feet or less of cable for the internal antenna or it is connected directly to the amplifier. This unit has a YAGI UDA antenna. I don't have a lot of signal in my area so I wanted a higher gain antenna. I mounted the antenna on a tower about 36' above the ground. I used a phone program to determine the direction to point the antenna. Pointing the antenna correctly can have a significant impact on the received signal. I reset my phone turned off the power for two minutes and then turned it back on, while on the tower to get the best signal information available and pointed the antenna as indicated. This could have been done better if I had someone inside to monitor signal strength but I was working alone. Inside, The signal inside increased from about -120 to -85. My Samsung Galaxy 6 Active only shows 2 bars LTE signal. My Mom's phone on 3G sent from 0 bars to 4 bars.Bottom line is it went from not working to working. This is inside a steel building and the phone signal just does not exist in there.I was expecting a better response on the LTE signal. I selected this unit specifically to work with our ATT service. I also selected the YAGI UDA as it is the best antenna offered. This is not the most expensive product available but certainly not the least either.I will attempt to improve the signal later when I work on the tower. I will be able to raise the antenna and have a helper to dynamically point the antenna for maximum signal.I have another unit by this manufacturer. I also get low LTE bars on that unit but the phones do work. That one has an omnidirectional antenna at 15 to 20 feet above ground. I don't expect as much from it at that level and without a directional antenna. With unit turned off, the phones do not work so we know it does help. My wife's older phone, Galaxy S3, gets full strength indications. I am not sure how the S6 is calculating signal or manages the bands but it is obviously different from the S3 and my Mom's LG.I have used amplifiers from another major brand and I picked this one because it had specifications specifically for ATT LTE.

My signal was hit-or-miss before I set up this booster. I was frustrated very often, about half the time, due to poor signal -- 4G would come, and then it would go without anything to indicate why it was good one minute, then lousy for the next couple hours. My office/home is about 5 miles from the nearest tower. The property has sharply inclined hills on both sides, so I assumed that I was not likely to get any help from any type of antenna, regardless....but I was desperate. Cable internet is not in the budget, if I could help it, especially since I am hardly at the property, except perhaps half the time of the year. So, I figured that I will give this antenna a try, in spite of my doubts and pessimism.I mounted the outdoor Yagi on top of a metal roof garage, the highest point of my property. The structures of the property, using https://www.amazon.com/gp/product/B001V6QZR4/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1. I mounted it straight to the roof, about a foot back from the edge of roof, wondering if the close proximity of the metal would diminish the ability of this antenna. I pointed the yagi in the approximate location of the nearest tower, using Network Cell Info Lite app (which I highly recommend, along with the Speecheck Pro app. Both are the proofs that I needed to verify if this antenna was effective, or not.....and I have about a hundred results so far, of tangible numbers that I can understand).Then, I ran the coax (which comes with the kit) down into the garage, where I have never, ever, been able to have broadband and occasionally drop calls, about 80% of the time if I go too far into the garage. So, I mounted the booster in the furthest and darkest corner of the garage, turned it on, watched the lights flashing on it for about a minute (the booklet states that the lights indicate that it is tuning itself during this time). And, withing thirty seconds, I watched my celluar bars go from 0 to 3. I tried the internet; and was able to get pages to load. My skepticism was weakened a little. But, this garage is not where I wanted to booster. So, I relocated the booster to the adjacent garage, which has the office/apartment attached. The booster worked worked well in that garage, too (where I also had the hardest of times getting calls or internet, before). That was as far as the 50 foot coax would stretch; and my desk was on the other side of an interior wall, approximately 40 feet further. The booster did not put-out or receive that far, it seemed. So I placed an additional 50 foot of coax on the yagi side, drilled a hole through the wall, ran the coax through the wall, and placed the booster on my desk. My phone sets beside it almost all the time, even right now as I type this review.The "tests". I have run many, many tests by using Network Cell Info Lite app and the Speedcheck Pro app, The first app shows me real numbers that my phone has better signal (sometimes much better signal) when the booster is on and nearby; and the second app, Speedcheck Pro give me the real numbers of how "fast" the internet that I have -- how fast, or slow, it is operating. And, so far, I have many, many positive results of how effective this booster is, according to my situation. I have tried many times to unprove the results turning it on and off, removing the whip antenna, etc.....and almost every time, my signal is stronger with the booster, rather than without.The whip antenna on the booster seems to have a coverage of only approximately 50 square feet, but i have not tested that very much, yet, I purchased the Sure Call dome antenna, but it was less effective by the tests I ran. https://www.amazon.com/gp/product/B0076CH4B8/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1All in all, I am very impressed with the effectiveness of this antenna. I tested it, and I tested it....and, so far, (I've had it for a week) I am super-exhilarated that it seems to work very well, except when it rains. Last night, was the first time that it rained during these tests; and the tests were not positive during the rain storm. Other than that, this booster has outperformed no-booster about 95% of the time of all the controlled tests that I performed.