http://www.macnn.com/articles/04/09/10/dr..bott.antenna.upgrade/
QuickerTek kit boosts Dr. Bott's AirPort BS antennas
updated 02:15 am EDT, Fri September 10, 2004
Dr. Bott antenna upgrade
QuickerTek today announced it is now shipping a new to work with all Apple Airport Base Stations, including the Graphite, Snow as well as both Airport Extreme Base Stations. (Dr. Bott's antennas are not compatible with all models.) The user-installable kit requires a soldering iron; alternatively, users can send their antenna to QuickerTek for $25 installation (plus shipping) and receive 24 hour turnaround service. The upgrade kit itself is $35.
