Ubiquiti Networks airFibe5X - Manual (Page 16)

2. Attach the RF cables from the antenna feed to the RF
connectors on the AF-5X in this combination: + 45° to
Chain 0 and - 45° to Chain 1.
3. Attach the External GPS Antenna to the RF connector labeled
GPS. Then place the magnetic External GPS Antenna on the
bracket (this is temporary; you will mount the External GPS
Antenna on the GPS Antenna Mount at the site).