I have a black Macbook running OSX 10.5.8. I also have an Airport Extreme base station. For the past few days, my computer will not acknowledge a wireless network is present unless it is within 2 feet of the base station. If it is within 2 feet, the signal strength is perfect and the internet functions like normal. I also used to be able to see my neighbors wireless networks under the Airport menu but those are all gone now too. I have reset my Airport Extreme, confirmed that it is broadcasting at 100% transmit power, unplugged Airport overnight, anything I could think of. So far nothing has helped at all. I am going to school in Grenada, West Indies so I am not close to any Apple stores or anything for help. This problem sprung up overnight and I did not install or un-install anything prior to the problem developing.