I have just one MacBook, and 1 airport express. i have a cable modem. i live in manhattan. on the airport, even plain ol' web browsing is arduous - a hollerback to dial up days. forget about streaming or large downloads - i can get a soda while waiting for the days email. if i plug the cable modem straight into the macbook, i'm back up to cable speeds - i can even stream 720 hd movies from apple's website. i have factory reseted the airport. i have turned on interference robustness on the macbook and airport. i have set the airport to channel 1 (everyone else is 6 or 11). i have jacked up the multicast to 24. i'm on g only. the networked is closed, and wpa personal secure. and i have cycled through a factory reset several times. i'm growing desparate here. please help. cnet ranks me about 80-90 kbps per second over airport; plug up to the modem and i'm around 1500. even hijacking the neighbors unsecured channel 6 gets at least 500. this sucks.