This has to be the coolest tip yet for WiFi. Increase your WiFi strength by making a simple antannae.
Visit this web site for ideas:
I made this little contraption out of a smoked almond can and our signal strength went from 1 bar to 3!
Instead of the WiFi signal radiating all around, you can direct it towards the area most needed.
This might not be the prettiest example, but it works!