Can someone tell me what this means? I was looking at this program (KisMAC) but I don't know what passive AirPort Extreme mode is. My real problem is the range of my airport card. Sometimes my classes are in underground classrooms and I don't get signal down there. Does anyone know of anything that I could do to strengthen my card's reception to get signal down there? Any apps? I'm using a pb G4 1.67 Ghz. Thanks