It became associated with popular radio personalities like Howard Stern, Opie and Anthony, Don Imus and Mike Francesa.

After the Viacom split in 2005, Infinity changed its name to CBS Radio; the company would later merge with Entercom, presently known as Audacy, Inc. Infinity was founded in 1972 by two former Metromedia executives Michael A. Wiener and Gerald Carrus, with the acquisition of KOME, an FM radio station that served the San Francisco Bay Area, and finally received its license by the Federal Communications Commission (FCC) a year later.

Within a year, it had purchased six more stations: KROQ-FM in Los Angeles, WJFK-FM in Washington, D.C., WQYK-AM/FM in Tampa, and KVIL-AM/FM in Dallas.

In 1996, it was announced that Westinghouse Electric Corporation (which owned CBS) would acquire Infinity Broadcasting.

[3] As a result of the Westinghouse purchase, Infinity was merged into the CBS Radio Group, with Karmazin as president.

Karmazin then offered CBS to Redstone, who eventually made a $37 billion proposal to merge the two companies.

Under the new ownership by Viacom, Infinity acquired 18 radio stations from its competitor, Clear Channel Communications (now iHeartMedia), which needed to divest them as part of its own merger with AMFM Incorporated.

At that time, CBS Corp. spun off the "new" Viacom, which included MTV Networks, BET, and Paramount Pictures, among other assets.