Ubiquiti PowerBeam AC PBE-5AC-620 Quick Start Manual page 13

11. Lift the Dish Reflector and align the two lower Hex Head
Bolts with the slots on the Lower Pole Bracket. Seat the bolts
in the slots.
12. Attach each arm of the Upper Pole Bracket to the Mounting
Bracket using a Hex Head Bolt, Lock Washer, and Flat Washer.