Customers are no longer limited to AM and FM radio in the car. Let's compare the different radio options:

Feature Digital Radio Satellite Radio Terrestrial Radio
Sound Quality Crisp digital signal Crisp digital signal Lower-quality sound
Commercials Yes No Yes
Subscription Fee No Yes No
Advantage Better sound than terrestrial radio. Customers still can get local radio favorites Better sound than terrestrial radio, no commercials and hundreds of stations Widely available. Doesn't require an upgraded radio system.