What's the bandwidth of the uplink from the AP to the network? 802.11a is nominally 54 Mbps: two clients pushing the full load would come close to filling Fast Ethernet. I suspect the uplink is the limiting factor.
Dave, the link is 10/100, but the 54Mbps is an aggregate throughput for all clients. The medium is shared. You could theoretically hit 54Mbps + 11Mbps on the one AP, since it supports both 802.11a and 802.11b simultaneously, but that is not what you'd really see -- more like a maximum of 50Mbps across both bands -- shouldn't be a problem for the uplink.
Mark
