Ubiquiti Networks airMA Omni Antenna - Manual (Page 6)

5. Attach the antenna to the top of the pole. (If you attach
the antenna to a lower point on the pole, then the pole will
block part of the signal.)
Note: The mounting assembly can accommodate a
Ø 1.5" - 3.0" pole.
a. Slide a Pole Clamp over each pair of Carriage Bolts.
b. Secure each Pole Clamp with two Serrated Flange Nuts.
c. Tighten all nuts to approximately 25 N-m (18 lb-ft) or
less to avoid deforming the pole.