+9dBi RP-SMA 15" 3x WiFi Booster Antenna Wifi Booster Replaces Factory Standard Antenna and Boosts the Range of your Router as much as 4x Fits D-Link Routers and most brands (D-Link, Linksys, SMC,) of PCI WiFi cards Omni-directional with +9 dB gain (compare to +2.5 dB on factory standard antennas) Some Routers will require two (2) antennas for extended range performance Compatible with all 802.11b and 802.11g WiFi network and devices