My setup is: FIOS cable modem is in the home office (wireless turned off) and airport extreme attached to FIOS modem via ethernet. This was the original setup and worked fine through most of the house. Added an airport express station in the kitchen to stream music from laptop to stereo. Generally fine, but periodic problem with wifi dropping to laptop (from Pandora/Internet). Now the problems start: Bought an Apple TV but TV room has very poor signal, so ATV could not reliably talk to computers. First tried adding another Airport Express in that room (didn't work), and ended up using Netgear powerline adapter. Apple TV now works, but want to have better wifi signal in that room and Airport express only works if also connected to powerline adapter. Every time I hook this up, however, the WIFI connection between the laptop and the Airport network in the kitchen drops. Tried fixing this by hooking up a MoCa adapter in the kitchen to plug airport express into (kitchen is on a separate power panel than the other rooms, so powerline does not work). Hooking up the Airport express to the MoCa adapter makes the kitchen Express unable to talk to the network, and also somehow prevents the laptop from finding any of the other airport devices. Hope this is clear enough. My guess is that Airport and FIOS MoCa are conflicting, but not being experienced at this, I have no clue how best to address. Thanks.