I recently discovered that one of my roommates had attempted to boost the WiFi signal by cutting up a soda can and placing it near the router, like this:
My roommate was probably following an internet guide like this one, which advises shaping the modified can "like a radar dish" and placing it around the external antenna of the router. However, our router has no external antenna.
Will either configuration actually boost the router's reception? I don't know too much about antennae, but I suspect that the second configuration works more like a shield.