Indianapolis Motor Speedway Radio Network

The Indianapolis Motor Speedway Radio Network (known typically as the IMS Radio Network or the INDYCAR Radio Network), is an in-house radio syndication arrangement which broadcasts the Indianapolis 500, the NTT IndyCar Series, and Indy NXT to radio stations covering most of North America. The network, owned by the Indianapolis Motor Speedway and headquartered in Speedway, Indiana, claims to be one of the largest of its kind in the world.

Source: Wikipedia — Indianapolis Motor Speedway Radio Network (CC BY-SA 4.0)