I have MIMO 4x4 Log Periodic External Antenna on a 30 ft. tower. I went from 1 bar of signal to 4-5 bars. Because I am 3.4 miles from the closest tower I knew that I was going to need something with some serious gain. I followed the Nater Tater guide for the install of the internal connectors. It because of the narrow beam path take a bit of tweaking so take your phone out with you and on the app go to More /Advanced Cellular Metrics and watch the signals for best results. And watch the SINR and get the max there.

I hope this may help. I am most of the time getting 250-325 Mbps download speeds and 17-21 Mbps upload. Also use only high quality coax cable. LMR-400 or better.

Here is the link for them: https://www.amazon.com/Periodic-External-Antenna-Hotspots-Routers/dp/B09VVWMS2F/ref=sr_1_3?keywords=waveform+4x4&qid=1656449639&sprefix=waveform%2Caps%2C247&sr=8-3