I have a three level townhome with the main Linksys N router on the first floor. I have a renter on the third floor who doesn't get any signal between the hours of 8pm-11pm. I'm assuming the signal is getting lost due to the other wifi signals from surrounding houses, and heavy internet traffic at that time. What is my best solution? 1. Buy an Airport Express as an access point on the second floor. It will be connected via Cat5 in my office because from what I've read, it only works as an extender/repeater with the Airport Extreme. 2. Buy an Airport Extreme to replace my 2 year old Linksys N router and see if the simultaneous bands and better range helps in signal strength. Any other suggestions would be greatly appreciated. On a side note, there's a Cat5 connection in my renter's room, but she wants the flexibilty to roam around and not have to have her laptop always wired during those hours.