So, I have a tri-level house where the internet/cable comes through in the basement, which is half-underground and brick wall-ed on the side. In that basement is my home theater system which contains a receiver, a ps3, a 360, an Apple TV, and a satellite receiver. This is all networked through my apple airport extreme. I then learned that my receiver only had wireless capabilities, which meant that I needed the $100 adapter. Instead of purchasing that, I bought an Airport Express (2011) (comes tomorrow), which I plan on connecting to my extreme and running a short ethernet cable from the express and to the receiver. Now, caddy corner, and one level up from that room is my office (30ft away; 3/4 signal), which contains my iMac and an old 360 that I recently refurbished and plan on plugging into the monitor. The 360 has no wireless adapter. Can I use my express as an adapter for my 360 (using the ethernet port), and can it run as a repeater for my iMac in that same mode? I searched the forums, but couldn't find this exact question. Any help would be greatly appreciated.