Approximately 20 days ago, I bought the ATNJ GSM 4g 1800mhz Signal Booster for my village because I don't have a landline phone (internet) and the signal from Vodafone is weak. Generally, the plot of my house in the village is 1 acre. I bought a 3-meter PVC pipe and installed the external antenna on it. Initially, I placed the pipe with the antenna inside the plot and had the booster inside the storage room. I tried rotating the antenna to find the best signal using Vodafone antennas and also used the OpenSignal mobile app in vain. I raised the antenna with the pipe to the 1st floor, and the reading I was getting was around -48 to -54dbm for outdoor and approximately +7 to +21 for indoor. When the mobile phone was close to the booster, it had a full 4g signal, but when I moved two meters away, it would drop and show +H.
I consider this particular product to be garbage, and it's a shame because I wasted 129 euros. If you have an opinion about this product, I would like you to write it.