Ubiquiti NBE-M2-400 NanoBeam M Quick Start Manual page 7

3.
Rear Housing.
4. Antenna Feed
a. I nsert the Antenna Feed into the Rear Housing, and push
until it locks into place with a click.
b. Lightly pull the Antenna Feed to ensure that it is locked
into place and the Release button is fully engaged.
Cable Door and detach it from the
Bottom View
Release Button