After the race went to live coverage on ABC-TV in 1986, then to NBC in 2019, the number of radio affiliates for the network steadily declined over the next two decades. However, the radio network's popularity remains strong, and maintains a cult following, particularly in the greater Indianapolis area, where the live television broadcast remains blacked out by WTHR (previously WRTV) unless the race is sold out. Also, to provide contractual continuity for stations which mainly carry the entire NASCAR schedule, PRN affiliates that wish to carry the Big Machine 400 NASCAR Cup oval event and Shell 150 Xfinity road course event are required to also carry the Indianapolis 500. If there are two different PRN and IMS Radio affiliates in a market, the IMS Radio affiliate retains the contractual right of first refusal.