I have a large house which is fairly old. I currently have a Comcast cable modem which the tech conveniently placed in the basement, connected by CAT5 to an Airport Extreme which is on the first floor and which broadcasts wirelessly for net access for most of the house. However, I just moved my office up to the 3rd floor, and the signal up there is awful. So, I have an electrician coming, and he is going to wire CAT5 up from the basement modem to the 3rd floor office, which is where I plan to move the Extreme (which is providing the primary wireless network, powering 2 printers and allowing my iMac to access the net). So, that means that the signal on the first floor (where my wife does most of her surfing on her laptop) is going to suck. I have an Airport Express, which I was planning on using to extend the network, but the connection between the Express and the Extreme is really weak because of the distance between the two. I was thinking about putting a switch between the modem and the Extreme, and wiring the Express into the switch. I am hoping I would essentially have 2 wireless nodes on the same network. But, it seems too simple. Thoughts? Problems? Anything I am missing? Do I need to run another CAT5 down from the Extreme on the 3rd floor, or will the switch be able to handle the back and forth? Thanks in advance.