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The Proxim GX90 will provide 45Mbps full duplex (90Mbps aggregate) and uses the full 5.8GHz band, half to send and half to receive. It is a common practice to use a flat panel and/or parabolic dish. A path calculation is used to determine the right antennas.

Depending on how much bandwidth is needed you might want to look at some other options. The issue with the GX90 is you need to make sure there is no interference. the radio ends (a high end of the spectrum and a low end) can be swapped around to help avoid interference but again it's a bandwidth hog. You can read my article on interference: "[url=http://www.hub.tm/WnYsh]Wireless Interference - The Effect on Unlicensed Wireless Backhaul[/url]"

If this is a primary link for any length of time I always recommend using licensed point to point wireless radios. See article "[url=http://www.aowireless.com/blog/bid/38494/Licensed-Microwave-Wireless-Backhaul]Licensed Microwave Backhaul[/url]." The price will be almost the same if not cheaper than the GX90. If the vendor did a spectrum analysis and proper path calculations the GX90 will work, but there is no guaranty against interference in the future. Trust me we rip out a lot of older Tsunami and GX radios and replace them with licensed radios all the time.