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Forum Discussion
What to do with antennas on R6900
Why not just follow the instructions in the manual?
Visit the support pages:
Support | NETGEAR
Feed in your model number and check the documentation for your hardware.
Look for the model number on the label on the device.
Begin with the Quick Start/Installation Guide.
You may have done that already. I can't tell from your message.
I mention it because Netgear gave up on supplying paper manuals years ago and people sometimes miss the downloads.