Dr. Bott is now shipping new "ExtendAIR" antennae for AirPort users. "ExtendAIR" antennae are designed to boost the range available from the AirPort Extreme Base Station. The Omni is an omnidirectional antenna that expands range to 250 ft. The Direct boosts signals to 500 ft. in a specific direction. According to Dr. Bott:
Dr. Bott Announces "ExtendAIR", range-extending antennas for Appleis AirPort Extreme Base Station.
Dr. Bottis ExtendAIR products are Apple-certified range-extending antennas for Appleis AirPort Extreme Base Station. ExtendAIR Omni extends the range of the AirPort Extreme Base Station in all directions to a 250 foot radius. ExtendAIR Direct extends the range in a single direction to 500 feet.
ExtendAIR incorporates proprietary technology to provide the maximum range for AirPort clients. The directional antenna lets you extend the range of a base station in a specific direction (for instance, linking a main building at one end of a campus with a temporary classroom at the other). The omnidirectional antenna lets you extend the range of the AirPort Extreme Base Station in all directions.
You can find more information about ExtendAIR antenea at the Dr. Bott Web site. The Omni is available for US$99.95, and the Direct is available for US$149.95.