I have a Teltonika Rut240 with firmware 12.2 and a T-Mobile SIM card in Cedar Park, TX. I replaced 2 whip antennas with this panel antenna and placed it in the same spot as my modem when it was on. I moved it around the window. The suction cup barely keeps it on the window (though admittedly I didn't clean the window before using it) and putting it on the suction cup was a bad idea as I just watched it fall off over and over again. In the end it performed worse than 2 whip antennas. I put back 2 whip antennas, put the modem on the windowsill and lifted it with a box and now I'm getting 4 signal bars and good bandwidth. It sometimes drops to 3 bars during periods of high network traffic, but is generally 4 bars. The signal level ranges from -53 to -69.
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