AM-5AC21-60 - Ubiquiti airMAX 5GHz 21dBi 60deg 802.11AC Sector Antenna Ubiquiti Networks AM-5AC21-60 is an airMAX sector antenna designed for use with Rocket radios. This model has a 60 Degree beam width, 21dBi gain, and supports 2x2 MIMO. The airMAX ac Sector Antennas are highly resistant to noise interference in co-location deployments and feature an innovative deflector design, together with the reduced sidelobes and backlobes, reject interference from other transmitters in the area - potentially on the same tower. With improved Signal-to-Noise Ratio (S/N or SNR), the airMAX ac Sector Antennas allow a higher-order modulation to be used, for example, 256QAM rather than 16QAM. This increases the number of bits per second for a fixed bandwidth (or data rate).