This instructable is on how to make a wifi wave guide antenna for FREEEEE! (Assuming you already have a few things.)
Step 1: Materials
Can (I just used a #10 can)
USB WIFI dongle
USB extension cord (my dongle came with one)
Step 2: Cut
Cut a hole in the can towards the bottom (see picture) just big enough that you can force the female end of the USB extension cable in. I just stabbed mine with a pocketknife a few times. You don't want the cord to be able to move around at all. If you make the hole too big, just wrap the end of the cable that you sticking in the hole with duck tape until it's hard to fit in.
Step 3: Plug In
Plug the dongle into the extension cord and the extension cord into your computer.
Step 4: Enjoy Cats, Violence
It will take some aiming and maybe even a tripod but you should definitely notice an increase in the bountifullness of your internets.
I went from 1-2 bars to 4 bars and I can play games with no network lag. I am not even in the house, but in an outbuilding. Also I am using a crappy $5 wifi dongle. Hope this helps someone!