Using an Airport Extreme located in the basement, I am unable to get optimum wireless signal in the upstairs portion of the house. If I add an Airport Express as an extender, would I have to have two separate wireless networks or would the Express be the same network? A single network would be preferable. If the above works, the goal would be having the Express located upstairs and hard wired to the Extreme downstairs. The Express would be hard wired via USB to a printer and the printer hard wired to an iMac. If I understand that connection correctly, it would allow for wireless printing on a laptop via the Express without having the iMac on. Is that correct? Thanks.