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The last station that we installed was in a remote area with very poor LTE coverage. Our modem took minutes to connect and sometimes failed for several hours. Mobile phones have trouble connecting there. Moving the antenna around, shifting the battery position and trying different modems and options had little effect. After reading various posts on EnviroDIY, we decided to try other antennae mentioned there.
For us, the Maximus antenna and other internal-to-enclosure antennae performed similarly – that is to say poorly at this site. As a last resort, we installed a $16 external antenna from Amazon https://www.amazon.com/antenna using an SMB to UFL adapter cable.
The result was a major success – the modem connects within 10 seconds and hasn’t missed a transmission since we installed it. The 10 foot cable did not overly attenuate the signal in our experience.