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Isn't 8 = 2^3 ... 3 * 3 dB = 9 dB down?
I would go bigger, if for nothing more than to make more of a statement with the antenna. Last I looked the HBU55 is $80 shipping included direct from Radio Shack. Realize it's big - a 12' boom.
You could put a 10' tripod straddling your roof ridge, and a short mast above that. Should not need any guy wires.
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