iHeartCommunications leaves few open channels on the radio dial. The company, formerly known as Clear Channel Communications, is the #1 radio company in the US, with more than 850 stations that reach some 245 million people. Its Premier Radio Networks produces syndicated radio content for more than 5,000 stations. Clear Channel also sells spot advertising for about 4,000 radio stations and 600 TV stations through Katz Media. (Meanwhile, sister company Clear Channel Outdoor Holdings is one of the world's largest outdoor advertising companies with about 840,000 display locations worldwide.) iHeartCommunications is a part iHeartMedia.