Ubiquiti Networks Airmax 900Mhz 13dBi 120 Degree 2x2 BaseStation Sector Antenna Unlike standard WiFi protocol, airMAX Time Division Multiple Access (TDMA) protocol allows each client to send and receive data using pre-designated time slots managed by an intelligent AP controller. This time slot method eliminates hidden node collisions and maximizes airtime efficiency. Ubiquiti AM-9M13-120 900 MHz 13 dBi airMAX 2x2 BaseStation Sector Antenna, high performance long range, seamlessly integrates with RocketM9, Ubiquiti AM-9M13 excellent cross-polarization isolation. The innovative airMAX Sector Antennas feature carrier-class construction and 2x2, dual-polarity performance. Reduced Interference, Higher Gain, highly resistant to noise interference, the airMAX Sector Antennas provide superior gain and beam performance for high-capacity, multipoint networks. Every airMAX Antenna has a built-in Rocket mount, so no tools are needed to install the Rocket BaseStation.