I just bought the new Airport Extreme (dual band) base station. I was previously using the Airport Express 802.11n. I wanted to get better range and use 5GHz and 2.4GHz simultaneously. I have a 100Mbit connection. I setup the Airport Extreme and I'm very happy with performance at 5GHz. Speedtest.net shows that I'm getting about 80-90Mbit/s, which is about the same as when I connect via LAN or directly to the outlet. However, when I use 2.4GHz, the speed suddenly drops to about 10Mbit/s, sometimes even 3-5Mbit/s. I've done several tests and with my old Airport Express I get about 35-45Mbit/s when using 2.4GHz. Why is the Airport Extreme slower at 2.4GHz? I've tried resetting, etc and still the same. Also, I've noticed that the range is shorter than my Airport Express! I thought it was supposed to be the opposite. One other detail I've noticed. With the Express, the Transmit rate is usually at 130. However, with the Airport Extreme, this value always changes and varies between 20 (or less sometimes) to 50+ to 30+ to 70+. It always jumps around. At first I thought it might be interference but I don't get this problem at all with the Express (tried setting them both at the same channel). Help! How can I improve the speed of the Airport Extreme at 2.4GHz?!