Depends what you call high gain.
The Simpson is a significant amount of dune travel IE the vehicle is pointing at the moon or the dirt 50 metres in front therefore so is your antenna radiation lobe.
I would def not recommend anything higher than 6 dBi and 4.5 dBi would be close to ideal
8 or 9 dBi co-linears etc would be fairly problematic and cause comms issues unless you are both on top of a dune






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