This will show you how to add a bi-directional, 2.4 GHz amplifier to your Proxim Symphony for under $100. Bi-directional means you can mount the amplifier at the antenna to help overcome any cable loss, and the amplifier will automatically switch between receive and transmit modes.
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, Added: 18 Dec 2006
http://www.qsl.net/n9zia/wireless/appendixD.html