My 12" PB has an airport extreme card. My Quicksilver G4 has a regular airport card. My kid's eMac has an extreme card, and my ex's FP iMac has a regular card. Both base stations are extreme. So how come only my Quicksilver doesn't display the "Use Interference Robustness" option in the airpoirt menu? And WTF is Interference Robustness anyway? <br><br>