I'm in the process of setting up a wireless network in my home in hopes that I will be able to work from my deck on sunny days. Came across this little video via LifeHacker on how to boost your wi-fi for free by just printing out a parabola template and adding some aluminum foil. It's purported to give you a 9-12 dbi boost and keep you from having to spend $40-$50 on a wi-fi extender.
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