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Unless you are designing a Point-to-Point system, you can't get 15 miles out of WiFi. Somehow, if you were designing a PtP, I suspect you'd already know what you need, and wouldn't be asking the question.
The Antenna FAQ Forum here has some basic antenna information, and may get you started. After that, there are literally thousands of sites. It all depends on what you are attempting to do.
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Thorn
"Read Altas Shrugged. Compare it to today. Repeat as necessary"
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