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A yagi, a panel and a grid are actually all highly directional antennae. They just differ in the manner in which they focus the RF energy. Any and all should work for this application.
Mainly it is a matter of aesthetics, and what will fit your area. A 19dB panel I have out in my parts area is 15" square, and is less then an inch thick. - A fairly typical size. A 19dB yagi would be about 22" long, but only about about 6"x6" at the base. A grid/design (usually 24dB) is around 24"Wx40"Hx16"D.
A 14dB panel is usually about 10" square, and might be easier to use mounted inside a window.
If you can actually get a poor signal with the little antenna on a WUSB11, then 19dB may even be overkill. You might want to consider something smaller and cheaper. Have you done the math for this?
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Thorn
"I'm The Doctor. I'm a Time Lord. I am from the planet Gallifrey in the constellation Kasterborous. I'm 903 years old and I am the man who is going to save your lives and all 6 billion people on the planet below... You got a problem with that?"
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