 More than 40 countries provide DAB, DAB+ or DMB broadcasts, either as a permanent technology or as test transmissions.DAB is not used in the United States.The United States' FCC argues that stations on such a national DAB Band would be more difficult to control from signal interference than AM/FM/TV because of the continent's large land mass; and corporations who sell DAB radio in North America could find it more expensive to market these types of radio to consumers.