I require a long range usb wifi adapter that isn't too expensive or too big. The airport on my MB pro dosen't seem to be long range and I need something a lot better but not to pricey. It is basically to connect to a wifi hotspot that is around 20/30 meters away from my house.
I have OSX 10.6.3 (Just for compatibility)

Any suggestions?

Have you upgraded to newer N router?

Have you upgraded to newer N router?The OP wants to steal signal from a neighbor 20/30 meters away. Buying a router sort of defeats the point.

...unless the router can act as a bridge/range extender. ;)