KMPX

The UHF channel 29 allocation in the Dallas–Fort Worth market was originally planned to be used to sign on KLIF-TV (which was to have stood for "Oak Cliff"); on January 15, 1953, the Federal Communications Commission (FCC) granted a construction permit for that station to legendary radio broadcaster Gordon McLendon.

Had KLIF-TV signed on, it would have been a sister station to radio station KLIF (570 AM). KLIF-TV was intended to operate from the Cliff Towers Hotel in Dallas, which formerly served as the studios of KLIF radio and would later house KGKO (1480 AM, now KNGO) and KKSN (730 AM, now KKDA). The broadcast license was issued that year, but the station never went on the air; the KLIF-TV license was cancelled in 1955. Since television sets were not required to include UHF tuners until the All-Channel Receiver Act went into effect in 1964, McLendon apparently had second thoughts about developing a station that might not have any viewers (another unrelated television station using the KLIF-TV call letters was later planned to sign on 1967, but also never launched).

Channel 29 signed on the air in June 1964[2] from downtown Dallas as KAEI-TV, which was owned by Automated Electric Incorporated and ran a format of automated stock quotes for eight hours a day. However, poor reception reportedly led to that station's demise later that same year. In 1966, three applicants tried to take over channel 29—Grandview Broadcasting (which later took itself out of the running), Overmyer Communications and Maxwell Electronics. In a successful bid to give both applicants a channel, Overmyer proposed changing out channel 29 for channels 27 and 33 at Dallas; Overmyer never built its station, and Maxwell signed on KMEC-TV on channel 33 in October 1967. Channel 29 was later restored to the market. In 1985, three applicants vied for a license to operate a television station on channel 29, including the Wise County Messenger newspaper, owned by former WBAP-TV (channel 5, now KXAS-TV) anchor Roy Eaton.

After years of debating, KMPX first signed on the air on September 15, 1993 as the flagship station of the religious broadcast network Daystar. It was founded by Daystar founders Marcus and Joni Lamb, under the licensee Community Television Educators of DFW Inc. From that point until 1999, its slogan was "The Heart of Texas". In 2003, Daystar acquired Denton-licensed PBS member station KDTN (channel 2) from North Texas Public Broadcasting.

KMPX was then sold to Liberman Broadcasting (which was renamed Estrella Media in February 2020, following a corporate reorganization of the company under private equity firm HPS Investment Partners, LLC), a sale that was finalized on January 13, 2004; after Liberman took over on that date, the station was converted into a Spanish-language independent station featuring programming distributed by the company. On September 14, 2009, KMPX became a charter owned-and-operated station of Liberman's Estrella TV network, which carries some programming seen during the station's tenure as an independent.

On September 25, 2020, it was announced that Tegna Inc. (owner of ABC affiliate WFAA, channel 8) would acquire KMPX for $19 million, pending FCC approval.[3] The deal includes a five-year affiliation agreement between Estrella and Tegna, as well as an option for Estrella to purchase WFAA's VHF license.[4] The transaction for KMPX was completed on November 20.[5]

The station's digital signal is multiplexed:

KMPX shut down its analog signal, over UHF channel 29, on June 12, 2009, as part of the federally mandated transition from analog to digital television.[7] The station's digital signal remained on its pre-transition UHF channel 30, using PSIP to display KMPX's virtual channel as 29 on digital television receivers.