I installed a WRT400N router via my PC several months back and used an adapter to utilize the Dual Band, Wireless N network. The product worked very well on my PC. I recently bought a 27" iMac. It easily connected to the 2.4 Ghz Wireless N network. Performance and reliability are both good. However, I cannot see the 5Ghz network listed as an available network. Video streaming is not as good without the 5Ghz network. Supposedly the 27" iMac (with built in wireless N) can achieve the Dual Band connectivity with Airport Extreme...but I do not want to spend money to replace a perfectly good router. Does anyone know how I can connect achieve wireless N connectivity on the 5Ghz band? Thanks.