The building of the free windsurfer (using the Ez-12 Parabolic Reflector Template) from freeantennas.com is particularly interesting. The website claims an amplification of about 9 dBi of gain with the standard size template and 12 dBi of gain if you double the size. Something I will definitely try tonight 
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Interesting little project. Would you mind sharing how your test went?
yeah id like ti know too..