Simple: make parabolic wi-fi addons http://www.freeantennas.com/projects/template/
Change the wi-fi signal to an more open channel. Use something like inssider and check for an open channel, and go into your routers settings and change the channel. http://www.metageek.net/products/inssider. Also try it with your wireless home phone, it can cause a problem
Another way is installing 3rd party firmware (if your router supports it....So look at the list) like DDWRT/Tomato Router?OpenWRT/Etc... And boost the power of transmission.
Moving the router to the middle of the house.
Get Wireless N networking.
answered Jun 22 '11 at 21:10