My lease is in the middle of Harmon County, OK (north of Hollis) with very poor cell service, even on top of a hill. My camera is definitely not in a good spot and couldn't get any reception with the external antennae Covert sells almost 15ft in the air. I tried this Yagi directional antennae from Amazon Yagi antennae link on a 15ft piece of 1.5" Sched. 40 PVC and got 2 bars! Pay attention to the cables and genders when making your connections.

Charlie
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Charlie

M&P-10 - Kel-Tec RFB - AAC Cyclone
Pulsar XQ-50
ATN OTS 336-50mm 9hz Thermal Monocular
ATN NVM14 NV Monocular