WREX began operation on October 1, 1953, as a primary affiliate of
CBS. It shared
ABC with NBC affiliate
WTVO, channel 17 (which signed on five months earlier), and also aired programming from the
DuMont Television Network. It was owned by Greater Rockford Television, a group of local businessmen. The station's call letters were selected in honor of Rex N. Caster, the son of station president L. E. Caster. Rex Caster was a First Lieutenant in the
United States Army who was killed in
France during
World War II. Besides serving its immediate area, WREX attracted viewers early on in its history from parts of the neighboring
Madison area. In fact, the two areas still share overlapping coverage among their television stations, especially in
Rock County, Wisconsin (technically in the Madison television market), and that market's ABC affiliate,
WKOW (channel 27) is a sister station to WREX, assisting with newsgathering in the northern part of the Rockford market. Until Madison's
WISC-TV (channel 3) signed on in 1956, WREX was the only VHF station for both the Rockford and Madison areas. This was because Rockford and Madison were sandwiched between markets where other VHF channels were already assigned—
Chicago (channels
2,
5,
7,
9, and
11) to the east;
Milwaukee (channels
4,
6,
10, and
12) to the northeast;
Davenport, Iowa–
Rock Island, Illinois (
Quad Cities) channels
4 and
6 (as well as
8 starting in August 1963) to the southwest;
Cedar Rapids–
Waterloo (channels
2,
7, and
9) to the west in eastern Iowa; and
La Crosse–
Eau Claire (channels
8 and
13) to the northwest, leaving room for only one VHF license in each market. During the late 1950s, the station was also briefly affiliated with the
NTA Film Network. The station lost DuMont when that network shut down in 1956. In 1963, the station was sold to the
Gannett Company; during the mid-1960s, WREX was briefly co-owned with the
Rockford Morning Star. WREX became a full-time ABC affiliate in 1965, when
WCEE-TV signed on the air. In 1966, WREX became the first television station in Rockford to broadcast in color. In 1969, Gannett sold WREX to the Gilmore Broadcasting Corporation, owner of
WEHT in
Evansville, Indiana. In 1987, Gilmore sold the station to ML Media Partners,
L.P. In May 1995,
Quincy Newspapers purchased WREX; the purchase was completed on July 31. Two weeks later, on August 14, WREX switched network affiliations with WTVO, taking that station's NBC affiliation while WTVO assumed WREX's old ABC affiliation. According to
Variety, the affiliation switch was forced by ABC in retaliation for Quincy
switching the affiliation of its
South Bend station
WSJV from ABC to
Fox earlier that year. On January 7, 2021, Quincy Media announced that it had put itself up for sale. A few weeks later,
Gray Television announced it would purchase Quincy for $925 million. While Gray already owned
WIFR-LD, the market's CBS affiliate,
FCC regulations permit the common ownership of a full-power and a low-power station in a single market. However, on April 29, Gray announced that WREX would be divested to Allen Media Group in a $380 million deal that includes, among other Quincy-owned stations, WKOW,
WXOW in La Crosse, and
WQOW in Eau Claire. The deal is expected to close during the third quarter of 2021. Though Gray would not have any direct ownership or control of WREX, one caveat of Allen Media's deal to acquire the station includes a 10-year agreement to carry WIFR-LD on a WREX subchannel, which would give WIFR full-market coverage for the first time since it went to low-power status in 2017. On June 1, 2025, amid financial woes and rising debt, Allen Media Group announced that it would explore "strategic options" for the company, such as a sale of its television stations (including WREX). ==News operation==