So I have recently set up (and eventually got working!!) an Extreme paired with three Airport Express units as well as an Apple TV (latest Generation). Only problem I have is that in one of my rooms (the one furthest away from the Extreme) the Express is struggling a bit and on Air Tunes the signal drops out quite frequently when playing music. So I am considering adding another "wired" Extreme upstairs to this room to cover that end of the house. In addition I was thinking of putting another Express in my sons room - to also cover the garden. My question is - is there a limit to the number of units you can have talking to one another _ I think they are working in WDS configuration (the wizard took care of it eventually so I don't know for sure) - and I am sure i read somewhere that you can only have 5 devices running in a WDS network? Would the Apple TV be classed as a device or is that simply a wireless client??