Thought I might share some images of HAWKING's claimed "15 db sector antenna" for the community. Fortunately I found this in a rather telling place, a retired hardware pile next to the trash can, hope to save you all from being bamboozled.
Here's a link to the Amazon page:
If you find this antenna in a trash can, you should leave it there, no joke.
Oh and by the way, there's always this http://www.instructables.com/id/DIY-WIFI-Antenna-Reception-Booster/