Also if it's your own network, you can address remediable factors... I just noticed today that my iBook can pick up at a greater range if interference robustness is off (oddly... on two open networks today, at the hospital and at my parents' house). Also if your MBP supports 802.11n (Mmm, sounds like a first generation CD model, so I guess no), then you could get an 802.11n router....otherwise, if your router can boost its signal, or if you can experiment with altering the antenna orientations / positioning.