KUSI-TV, virtual channel 51.1, is an independent television station based in San Diego, California. The station is owned and operated by Channel 51 of San Diego, Inc., a wholly owned subsidiary of McKinnon Broadcasting, owned by Michael D. McKinnon (66.26%), brother C. Dan McKinnon (17.48%) and sons Michael Dean McKinnon and Mark Daniel McKinnon (08.13% each). Channel 51 of San Diego, Inc., a California corporation & Texas Television, Inc., a Texas corporation are wholly owned subsidiaries of: McKinnon Broadcasting, Inc., a California corporation. As of August 31, 2010, it is now McKinnon Broadcasting's only station property after it sold off its two Texas stations to London Broadcasting.

KUSI is available on cable channel 9 (standard definition) on all of San Diego's area cable systems, Time Warner, Cox, and AT&T U-verse. Time Warner Cable carries KUSI's high definition signal on cable channel 709 while Cox and AT&T u-verse carry the channel on 1009. The station is also available on its customary Channel 51 position on both of DirecTV's and Dish Network's Local Channels packages, but neither satellite provider carries KUSI's HD signal. The station is also rebroadcast on K12PO, a broadcast translator licensed to Murrieta, California.