Wireless LAN

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Currently I'm using a wireless broadband internet connection hooked to my wireless router to share the internet connection to my two PC and a laptop. Now what I'm up to is how to extend the range of my wireless router to an area of approximately 1000 square meters and adding another PC and a couple of laptop. Using a range booster may help but that will add to my expenses and that costs a lot for me. I'm in the process of researching for a good design for building a home made antenna for my wireless router. Any comment/suggestion will be highly appreciated.