UBNT Ubiquiti 2GHz AirMax Dual Omni, 13dBi w/ rocket kit

The first of its kind, airMAX Omni antennas deliver carrier-class, 2X2 dual-polarity, omni-directional MIMO performance. They are designed for seamless integration with Ubiquiti airMAX Rocket hardware.

http://dl.ubnt.com/datasheets/airmaxomni/amo_ds_web.pdf