This Ubiquiti sector antenna is 3 antennas in one. Each is a 5 GHZ, MIMO, 30 degree sector antenna offset by 30 degrees, giving 3 x 30 = 90 degrees of coverage. It requires 3 airMAX radios.
You can mount three Rocket5ac Prism radios on the airPrism 5 GHz 3x30° HD Sector Antenna, model AP‑5AC‑90‑HD, for PtMP links. Each Rocket radio corresponds with a specific 30° beamwidth and independently transmits and receives.