Bests & Worsts Reviews from Amazon

I purchased 3 models of 4G LTE filters to test, this Antra ATF-700 for $15.99, the Channel Master CM-3201 LTE Filter for $20.25 and the Kenable 4G LTE filter (labeled Mercury AF4G) for $7.14. They are all similar low pass filters but the CM is more expensive than the others. The CM and Antra filters are rated to pass signals from 5-694 or 699 Mhz while the Kenable lists 5-300 Mhz and 470-790 Mhz so basically 5-790 Mhz. I don't know why they go down to 5 Mhz since there are no TV signals down that low and they could cut off everything below about 170 Mhz but since they are all just low pass filters they can't block lower frequencies, only higher ones. The Kendra claims to be able to pass power for mast mounted amplifiers while the others don't say but they will do it as well. Both the Antra and CM filters worked to remove all cellular signals, 3G, 4G and LTE but the Kenable failed to remove LTE signals in the 700 Mhz band. Here in the Phoenix area we have VHF TV channels on 180-204 Mhz and UHF channels from 476-590 Mhz. Using a spectrum analyzer I found 3G and 4G cellular signals at 865 and 883 Mhz and LTE at 738 Mhz. The Antra and CM filters removed all these cellular signals without any noticeable reduction of TV signals but the Kenable was unable to remove LTE signals at 738 Mhz since it passes everything up to 790 Mhz. They might do better to also block FM radio signals around 100 Mhz since those tend to be even stronger than TV channels. While these do work the question is do your really need one and the answer is probably not. A TV antenna doesn't pick up cellular signals very well so the level is lower than any of the TV signals and not likely to cause any problems. The exception would be if you lived next door to a cell tower that was causing a lot of interference and you need to filter it out. The photos of the spectrum analyzer display show the TV channels on the left with 3G and 4G cell signals on the right and LTE signals just right of center in one photo while the other photo shows the results with the filter installed that only lets TV signals through on the left.