I’ve had a few clients recently with large homes that require more than one wireless access point. When using muliple access points all SSID’s and passwords can be the same, but channels must be different to avoid interference. I try not to use channel 6 at all because it’s the default for most wireless routers. I personally like using channels 2 and 9 because they are rarley used by neghiboring networks. And, if you only have one access point please try to place it in the middle of the house for optimal coverage.
Note: For Verizon Fios subscribers, it is possible to add another wired internet port wherever you have a cable line. You need a special coax adapter which is not sold through Verizon, but is manufactured by the same company that makes Verizon’s modem and routers.