Proxim Skyline 802.11a Access Point (4040)

Overview
PN4040 / Model 4040

Per the FCC technical description...
 * the (stock) usable frequency range of the device is 5180-5320MHz w/ 20MHz wide and stepped channels
 * the device has a (stock) maximum output power of 50mW
 * peak antenna gain for the stock antennas is 6dBi

Links of Interest
Product page (via archive.org)