I had a similar problem not that long ago. Make sure it is away from other computer hardware and up high on a shelf if you can. I had mine sitting about waist high on my computer desk and couldn't even get a signal on the other side of the room 10 feet away. now it is mounted about 6 feet off the floor and has a good signal at the other end of the house. It doesn't take much interferance to distroy a good signal.
Born2fly