Unfortunately, this excellent resource on building your
own high-gain antenna reflector for cheap is currently down,
but it is still available in the Internet Archive:
<http://web.archive.org/web/20060428021820/http://www.freeantennas.com/>

--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>