channel 21On Friday, KDLT will move from channel 46 to channel 21. KDLT-TV, virtual channel 46 (UHF digital channel 21), is an NBC-affiliated television station licensed to Sioux Falls, South Dakota, United States, serving eastern. The station is owned by Gray Television, as part of a duopoly with NBC affiliate KDLT-TV (channel 46). KDLT started broadcasting from Mitchell, South Dakota as KORN-TV on channel 5, an ABC affiliate. Check out today's TV schedule for NBC (KDLT) Sioux Falls, SD and take a look at what is scheduled for the next 2 weeks. Find Antenna TV in the Sioux Falls/ Mitchell area: Over-the-air: KDLT 46.