The Liveradio Cube is a inexpensive Internet Radio with WIFI capabilities. Having it working on my home network has been quite tricky. This thread pointed to using WPA.
How to configure the Airport Express for WPA (and not WPA/WPA2):
1. In airport utility choose manual setup.
2. Under the Wireless tab select ‘802.11b/g compatible’ for ‘radio mode’.
3. Click option button and select ‘WPA personal’ in Wireless security: NOT the wpa/wpa2 one!! Set your password to 13 characters.
4. ‘Update’ and reboot the Airport.