Could anybody share some knowledge about mixing old and new macs and Airport base stations? At home I have a PowerBook with 802.11b and an iMac with 802.11g. They are served by an 802.11g-capable Airport Express for LAN, Internet and AirTunes. Now I'm about to add a MacBook and a Time Capsule, both with 802.11n. What is the best configuration to connect all this at the best possible speed and not loose functionality? Most important is that the MacBook(n) communicates with the Time Capsule at n-speed without being slowed down by the PowerBook(b) or the iMac(g). The Airport Express(g) is still needed for AirTunes. All machines need Internet access. It's OK if the MacBook(n) has to change logical base station to perform different tasks (Internet, LAN, AirTunes) at optimal speed. I have heard that the 5 GHz band has difficulties to pass through walls. How bad is it? How do you notice if it has problems: does the speed decrease, or does the connection suddenly disappear? Please share any knowledge or experience that you may have! Thank you.