Homebrew wifi antennae hack to extend range
Here's a handy video on how to build an extended range wifi antennae. Obviously this won't work for your built-in laptop wifi but if you have one of those cards that plug in to your PC with the little antennae or a laptop card with external antennae this could do the trick. The bit at the end with colouring a drinking straw with black marker to give it a "professional" look is hopefully a joke but the rest of the video appears solid. The one caveat to doing this yourself is there is a bit of soldering needed.