Do I need to connect both Antennas for the AXN10/MXN10 to work?

Yes, if you are connecting your AXN/MXN to your network wirelessly, you will need to connect
both of the supplied antennas to enable full Wi-Fi functionality and the strongest possible
wireless network connection.

Bluetooth functionality will also only be possible when one of the antennas is connected to the port with the Bluetooth symbol.