Airespace will offer multiple-in, multiple-out antennas for its access points later this year: The Intelligent RF Access Point (IRAP) will ship third quarter, and uses the MIMO technology to extend range. MIMO was pioneered by Airgo, which has not supplied the technology for IRAP; Airgo expects to have manufacturers incorporating their MIMO reference design in the next few months.
MIMO uses multiple input and output antennas to better sort out actual signal from noise, which can effectively extend range. It works best in combination with both client adapter and access point incorporating MIMO, but there are benefits for an access point by itself.
Airespace is effectively either reducing the number of access points an enterprise needs (although raising its per unit price tag), or offering better overlapping coverage in the same areas increasing throughput for a network.