KFXB-TV, virtual channel 40 (UHF digital channel 14), is a Christian Television Network (CTN) owned-and-operated station licensed to Dubuque, Iowa, United States, and serving the Eastern Iowa television market (Cedar Rapids–Waterloo–Iowa City–Dubuque). The station's studios are located on Main Street in downtown Dubuque, and its transmitter is located in extreme southwestern Grant County, Wisconsin (in the Madison television market).