1540 signed on as WKKR in 1967[2] serving Pickens, South Carolina. The station became WTGF in 1977 and then was sold in 1979, becoming WPKZ in 1980. On January 24, 1984, the station was sold to Tabernacle Christian School in Greenville, with the call sign changed to WTBI. An FM station simulcast, WTBI-FM, licensed to Greenville was added in early 1991, later upgrading its power in 2007, covering all of the area covered by the AM signal.[3] 1540 only provided coverage to the local Pickens County area, and B grade coverage to much of neighboring Greenville County. As WTBI, both stations aired a mix of Southern Gospel music and preaching from Fundamental, Independent Baptist churches. Much of the preaching and teaching programming is produced by churches in the Greenville area, in Pickens County, and from various churches in the Appalachian Mountains area. Other churches from other parts of the United States also produce programs. The station also featured Sunday, Wednesday, and other special worship services from Tabernacle Baptist Church.
In 2020, the simulcast was broken after 30 years and 1540 AM became a Spanish religious station known as “Radio La Voz, 1540.” After broadcasting via lease agreement for two years, it was donated by Tabernacle Christian School to Berea Baptist Broadcasting, who had been leasing it.[4] The donation was consummated on September 12, 2022, and its call sign was changed from WTBI to WBPB, effective November 1, 2022. [5]