One of the minor nuisances of 11.04 is the lack of pre-set radio stations in Banshee. I made a list of the radio station URLs that were included with Rhythmbox and have listed them below:
HBR1 – Dream Factory
You can take any of these URLs and add them to Banshee. To do this start Banshee up and then follow the images below to add the stations you prefer.