DIY Biquad antenna for a 900mHz

I whant to build a 900 mHz patch tx antenna. I looked in some web pages and i found a biquad antenna for 24gHz.
Can someone please help me with the diamentions for a 900Mgz Biquad antenna for i cant find it......

Here is the diamentions for the 24mHz antenna.

http://martybugs.net/wireless/biquad/double.cgi

Thanx
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