I have an Airport Extreme (AE1) as my wireless router, with two other Airport Extremes (AE2 and AE3) connected to it via ethernet and operating in bridge mode. Together they cover the first floor of my house with wifi, but I want to use an Airport Express (AX1) situated on the second floor to connect wirelessly to AE2 and extend my wifi network to the second floor of my house. Nothing I have tried has allowed AX1 to extend my wireless network. I'm using the latest Airport utility in Mavericks, and AX1 is the old plug-in type but it's the newer "n" version that is still configurable by Airport Utility. Any suggestions would be appreciated.