My setup is that I have a dual band combo model/router (Netgear; not my choice but that's the way it is). It actually works very well, but I have moved my study out into a small guest house that only gets a marginal signal, and only the 2.4 band. I bought a Cisco extender that works fine in giving me a great signal in my study. However, my ATV, which is very close to the router, I am assuming keeps connecting to the 2.4 band that is not coming from the extender but directly from the router. I assume that's the case, because even though both devices are connected and iTunes is on, I get a cannot connect to my library message when I try and connect to my iMac. Does this make sense? Does being on the same network mean they must both be on the same "band"? Or in the case of the extender and my iMac, on the same "sub-band"?