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The pre built antenna could also be used but its IP60 .
Regarding the IP rating knowledge you can refer to the attached image
We also have IP67 antenna.
But as this antenna is SMA not FAKRA -D and Rut850 has FAKRA -D connector type . So, you will be needing the FAKRA-D to SMA connector to make it work .
Or you could also use some third party antennas.