Hello @uberdome,
unfortunately we don’t test such scenario in our lab.
But theoretically there should be no issues if you put only one 4x4 antenna and terminate other chains. To avoid self-interference.
I would suggest you to try to connect the antenna to chains 0/1/4/5. And compare performance between Sector and Split-sector mode. Keep the setting with the best results.
Omni/Split-sector article for your reference.
Thank you for the interesting question!