WLAN Antenna   Wireless Lan Antenna: Omni-directional and Directional radiation patterns. Omni-directional antennas propagate RF signals in all directions equally on a horizontal plane (i.e., throughout the facility), but limit range on the vertical plane. Gains ranging up to 6 dB Directional Antenna A directional antenna (often called a yagi) transmits and receives RF energy more in one direction than others. The higher gain antennas will have a narrower beam width. Gains ranging up to 12 dBi and higher. Mobile Antenna  Mobile Antenna: 1/4 wave, 1/2 wave and 5/8th wave operating at single or dual frequencies for mobile communication throughout private and business sectors.  Newer mobile communication market: Cellular phone,PCS: Personal Communications Systems,GPS: Global Positioning System. High Gain Antenna High Gain Antenna: The high-gain antenna (HGA) is an antenna with a focused, narrow radiowave beam width. This narrow beam width allows for more precise targeting of where you want the radio signal to go.