Transceivers are perfect when you need extra signal strength - at full wireless speed.
What is a transceiver? Essentially it is your AirPort wireless card in your Mac.
We make ones that go outside, and are far more powerful.

Wireless 802.11g High Power USB Adapter 316mW with 6dBi Directional Antenna

FEATURES
􀁺 High gain 6 dBi Directional Antenna
􀁺 Support WMMTM (Wi-Fi Multimedia) QoS function.
􀁺 64/128/256-bit WEP and WPA/WPA2 data encryption security
􀁺 Support Windows 98SE, Me, 2000, XP, Vista, MAC and Linux.
􀁺 Suitable for notebook or desktop PC
􀁺 Support USB 2.0/1.1 interface.
􀁺 Support Software AP Bridge function
􀁺 Support NDS and PSP X-Link
􀁺 Support Roming

$450