Buy on Amazon.com : http://www.amazon.com/gp/product/B003JA5RTM?tag=lottalatte-20

BlueProton Gsky 1000mW 1W 802.11b/g High Power WiFi USB Adapter w/ 9dBi Omni Antenna

Ultra high power high sensitivity designed for coverage-hungered connectivity at long range
Connects at a full 54Mbps High-Speed Transfer Rate for 80211g
9dBi omni antenna
Mighty Base -Output Power -1000mW