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Teltonika sell a dual LTE antenna:
https://teltonika-networks.com/downloads/en/combo-mimo-mobile-roof-sma-antenna/Datasheet-Combo-Mimo-Mobile-Roof-SMA-Antenna-003R-00252-v1.2.pdf
Does anyone here know whether it requires a ground plane, and/or have any more detailed data-sheets than the sales flyer above?
Cheers!