I have 2 of the Airport Extreme 802.11n base stations (the most recent version). I have them connected in "bridge mode" through an ethernet cable. I have them placed at opposite ends of the apartment (we have a long one-floor apartment). Whenever we're at one end of the house with our laptop it connects to the wireless network fine and gets a full signal (usually a transmit rate of 270+). If we move to the other end of the house, the signal gets weaker rather than maintaining a strong signal (the transmit rate usually drops below 10 when a the opposite end from where the laptop started), indicating that its connected to the original base. The current fix is to shut the laptop and reopen or switch off/on the wifi adapter. Both laptops are MacBook Airs running Mountain Lion (OS 10.8). However, this was a problem in 10.7 as well. All laptops and airport bases have been updated with the latest software.
As I understand it, if the SSID names are the same, it should maintain a strong signal throughout. How do we get it to automatically switch between the bases?