i have a 15" powerbook and i pick up a signal at work and it usually says full signal but it doesnt go to fast and fades in and out....ive seen antennas that Quickertek makes for macs that are are 100 dollars and before i try one of them im wondering what other options i have....ive tried two different wireless cards but neither of them worked...does anyone know any wireless cards or usb signal boosters that will work with a mac.....thanks