Easy and inexpensive way to boost your signal by 2 bars.
http://www.tvkim.com/watch/1417/kim-on-komand-beer-can-helps-increase-wi-fi-coverage
I made one yesterday and it works. Went from yellow to green on my laptops wi-fi signal status.
The idea is that the antenna becomes more directional with the can. So, if it happens to be aimed at the source of the signal, you’ll get a better signal. If it’s pointed away, it will get worse.