Well here's mine, completely inspired by reading this thread. I made them out of a couple of cans of Cheez Curls, held together with cardboard and duct tape. I used this template
, so thank you M. Erskin and everyone else.
As you can see from the pics, I get a marginally better signal with the ducks installed. I don't understand any of the formulas or anything, I just traced the arc and punched a hole at the focal point.
Usually, I am sitting within 30ft or so of my AP, so these things weren't an absolute necessity, I just thought they'd be cool to build. And so easy, too. The hardest part was eating all the Cheez Curls first *burp*--
quidquid latine dictum sit altum viditur