However I've moved the Apple Extreme up to another floor, so service for the Apple TV downstairs is spotty, and re-inputting the WEP password is a continual pain. I'm going to try adding an Apple Express to the mix and see if it will act as a bridge or repeater for the network, but operate downstairs next to the Apple TV, with the goal of reducing the timeouts and resets.
I'm in the reset stage of reconfiguring the Express. Here are the instructions (from Macworld):
Soft reset: Plug the Express into power, launch Network System preferences and choose Airport from the popup. Click the TCP/IP tab and choose Using DHCP from the Configure menu. Press and hold the device's reset button for 1 second. The light will flash yellow and you'll have 5 minutes to make changes before the Express reverts to its previous configuration. What a pain in the ass.
Hard Reset
With the Express plugged in, hold the reset button for 10 seconds. The LED will flash green and the device will reset.
Factory Default
Unplug the Express and hold the reset button. Whilst still holding reset, plug the device in. Keep holding until you see the LED flash four times. Release the button to reset the device.