The device is called "WindSurfer" and is probably the cheapest and working WiFi booster available.
You would need the following items to make one
Gluestick, Sticky Tape
Aluminum Foil and WindSurfer Template
Download WindSurfer Template
WindSurfer PDF file
Resize the template using either MS Word, Paint etc. or Download The Resized Template
IMPORTANT : The bigger the size of WindSurfer the better will be the Wi-fi signal strength and range.
Once you have done the resizing, print the template.
Now stick a cardboard behind the template, the cardboard must not be too hard use something that is flexible like a calender etc.
After you've stuck the cardboard, cut out the two parts. The first part will be the one which says "WindSurfer" and the second part will say "FreeAntennas.com".
Stick aluminum foil to the second part.
Now cut slits in the second part using a knife. Then insert the slots from First Part into the slits. Use sticky tape and tape them nicely.
Finally pinch two holes where a plus sign appears.
There you go its done. place the WindSurfer on your WiFi antenna and check your Wifi Signal, you'll find an increase in signal bars.
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