I have been trying to cover a large house and been using Airport Express N wifi units using one as an extender, this has produced disastrous results (poor speed and repeater kept crashing). I have now pulled CAT5 in so I can feed both units by cable from the router. My question is; should I set them up the with the same SSID and same or different channels or set up two discrete networks? I may also add a third AP in the future. Any advice on this would be much appreciated as the info in the Apple online help is spartan to say the least!