My current setup is Cable -> Cable Modem (Modem only mode) -> Airport Base Station -> 4x Airport Express (newest models) around the house. I don't know what it is the wifi connection is absolutely rubbish in my house to the extent that I have had to put in 4 Express' to get full coverage everywhere. This works quite well but I want to extend wifi out to the garage. I bought a second hand Extreme (5th Gen) and put in the garage as an extender but it's no use the wifi signal constantly drops and it doesn't extend anywhere beyond the door. So I ran a cat6 cable out there. Can I connect this to the extreme to then extend the wifi? Also in this scenario can I use the other ports on the extreme for wired connections out there?