I have a 3 story place with 1 WRT54G up stairs (3rd floor, office/cable modem), and was getting a very low signal downstairs and in the back yard. I had a spare WRT54G, and just ran a cat5 cable from upstairs to the lower level (same wall space as phone/cable/alarm etc, NOT ac), not only had a great signal downstairs, but also in the back yard. If it's feasible for you, I just have the output from one of the router jacks plugged into the input of the one downstairs (same SSID and channel).. Works great and lets me work from the backyard.