Are those elements pictured 1/2 wavelengths for 850MHz? They look a little long. Your demensions look close in on the data sheet. The reflector element at 6 3/4" total, it almost looks like you have 6 3/4" above and below the boom. Maybe its just the pic play games with my eyes. Also most of the plans I've seens or design calculators make the reflector the longest element, drivin element is cut to the center frequency and then the director elements get shorter as they go on down the boom. I have a home brewed 500MHz yagi now outside and it works awesome. Can't beat the performance for the money spent on it.
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