I need help to extend the range of my network, I have a Buffalo Wireless-G router which is also used as a wired router to the PC, but it doesn't have enough range to make it to the other side of the house. I have changed channels but it hasn't helped, I also can't move the router as it needs to work with the PC & it is where the modem is located. I was thinking I might need a better antennae but didn't know which one to get.