The station first signed on the air on January 1, 2005, as the sixth commercial television station to sign on the air in the Columbia television market. Founded by St. Louis-based Roberts Broadcasting, it originally operated as a UPN affiliate. Prior to WZRB's sign-on, Sumter-licensed WB affiliate WBHQ carried UPN programming on a secondary basis, airing its prime time schedule on a two-hour delay. UPN programming was not available at all in the Columbia market for a few months after WBHQ dropped its secondary affiliation with UPN in August 2004. On January 24, 2006, the Warner Bros. unit of Time Warner and CBS Corporation announced that the two companies would shut down The WB and UPN and combine the networks' respective programming to create a new "fifth" network called The CW. WZRB became Columbia's CW affiliate when the network launched on September 18, 2006; WKTC took the MyNetworkTV affiliation, and joined that network when it launched two weeks earlier on September 5.
Sale to Gary Chapman and switch to Ion
On December 2, 2013, Roberts filed an application with the Federal Communications Commission to sell WZRB to Radiant Light Ministries, a subsidiary of religious broadcaster Tri-State Christian Television; however, on December 11, the United States bankruptcy court gave initial approval for a plan by Roberts' creditors to instead transfer WZRB and its sister stations, WRBU in St. Louis and WAZE-LP in Evansville, Indiana, to a trust overseen by former LIN Media CEO Gary Chapman with Ion Media Networks as its beneficiary, with Roberts' attorney subsequently stating that Ion would purchase the three stations. On February 10, 2014, WZRB became an Ion Television affiliate, carry the network's programming for the majority of its broadcast day, resulting in the removal of WZRB's syndicated programming inventory in the process. For the first month of its tenure as an Ion O&O, CW programming—including primetime shows—continued to air on the station as a secondary affiliation, pre-empting one hour of Ion's daytime lineup and the first two hours of its primetime schedule. This was a departure from the standard Ion programming structure ; as a result, it marked the first time since 2008, the end of a two-year period in which Ion Media Networks ran MyNetworkTV programming on select i/Ion owned-and-operated stations, that the company had carried another network's programming on its stations. This arrangement proved to be only temporary, as existing MyNetworkTV affiliate WKTC took the CW affiliation on March 17, 2014, resulting in WZRB beginning to carry the entire Ion Television schedule.
Aborted sale to Brian Brady; sale to Ion Media Networks
On January 29, 2015, Cedar Creek Broadcasting agreed to purchase WZRB and WRBU from the trust for $6 million; following the deal's completion, Ion would have continued to provide services to the stations, and they would continue to be Ion affiliates. On May 9, 2017, the Broadcast Trust informed the FCC that the sale to Cedar Creek Broadcasting had been terminated. One month later on June 20, 2017, Ion Media Networks announced that it would purchase WZRB and WRBU from the Chapman-owned/Ion-managed trust for an undisclosed amount. The sale was completed on October 19, 2017.
Digital television
Because it was granted an original construction permit after the FCC finalized the DTV allotment plan on April 21, 1997, , the station did not receive a companion channel for a digital television station. Instead, during the week of January 19, 2009, before February 17, 2009, which was the end of the digital television conversion period for most full-service stations, WZRB turned off its analog signal and turned on its digital signal. On March 29, 2011, WZRB's license was initially canceled by the FCC for failure to file for either a license to cover or an extension of its digital construction permit. However, Roberts Broadcasting filed an appeal, stating that the licenses to cover were improperly filed upon the digital transition. The FCC agreed, and reinstated the licenses of the two stations on April 19. Roberts had to file for new licenses to cover. WZRB's high definition feed is not currently carried by AT&T U-verse in the area; however, it is carried by Charter Spectrum, Dish Network and DirecTV.
