Airport not connecting to network

The airport card in my Macbook will not find any networks anymore at my house. When I go to campus, it connects perfectly fine to the network there and is able to find networks around. Once I come home, it will not find any wireless networks. Several other laptops will pick up the network just fine and connect perfectly. My Macbook works fine wired to the network, but cannot find it wirelessly. I used to be able to see 8-10 networks in my home neighborhood, but now I am not able to find any. What can I do to fix this?