The Cisco Aironet 5-GHz 17-dBi Sector Antenna (AIR-ANT5117S-N) operates in the 5-GHz frequency range and is designed for use in point-to-multipoint environments. The antenna is designed to be used outdoors and can be mounted on 1.5 in. to 3.5 in. (3.8 to 8.9 cm) diameter masts.