Ubiquiti PowerBeam M5 PBE-M5-620 Quick Start Manual page 8

6. Attach the horizontal slot of the Support Arm to the Upper
Pole Bracket using a Hex Head Bolt, Lock Washer, and
Flat Washer.
Note:
on both arms of the Upper Pole Bracket.
7. Attach the Brace to the pole brackets using the four Screws.
Ensure that the degree settings are the same
Degree markings
facing outward