KUUB (88.3 MHz), known as Avanza 88.3, is a public radio station in Salt Lake City, Utah, United States, airing Spanish-language radio programming from Radio Bilingüe. It is owned by the University of Utah and originates from the Eccles Broadcast Center on its campus, with a transmitter in the Oquirrh Mountains southwest of West Valley City.

From 1992 to 2024, the 88.3 frequency in Salt Lake City was KCPW, a public radio station founded by Community Wireless of Park City, owner of KPCW in Park City. KCPW served as a second NPR station for the Salt Lake City area, sharing some programs with KPCW and partially overlapping in programming with the University of Utah's KUER-FM. In the late 1990s, this programming helped erode listenership at KUER, which responded in 2001 by dropping its classical music programming. For a time in the 2000s, it was simulcast on 1010 kHz to increase its coverage area.

In 2008, Wasatch Public Media was formed to buy KCPW from Community Wireless. To do so, it incurred substantial debt that dominated its finances for nearly a decade. During this time, KCPW let go of NPR programming in 2013 to save money, and it narrowly avoided losing American Public Media–produced shows in 2014. The debt was refinanced in 2017, but lingering financial issues and the impact of the COVID-19 pandemic led Wasatch Public Media to put the license up for auction in 2023. The University of Utah bought the station to air Radio Bilingüe programming, and KCPW ceased its format on October 31, 2023; three of its local programs continued under the auspices of Utah Public Radio.

In 1988, KBYU-FM moved from 88.9 to 89.1 MHz, opening the door for a new station on a lower frequency in the area. On June 24, 1991, Community Wireless of Park City, Inc., the owner of that city's KPCW, received a construction permit to build a new non-commercial FM station in Salt Lake City from the Federal Communications Commission (FCC).

KCPW made a quiet debut on November 1, 1992, broadcasting its signal from the top of the University Park Hotel and Suites in Salt Lake City and sharing a studio with KPCW in Park City. It shared its morning programming with KPCW before airing nine hours of NPR news and talk programming, switching at night to classical music and the BBC World Service. While naming the offshoot of KPCW KCPW was seen as clever, it would later be cited as a source of confusion by listeners, who regularly confused the two stations.

Slowly, KCPW gathered an audience. By 1999, it had one-third the listenership of the University of Utah (U of U)'s KUER-FM, which had come to be seen as its rival even though Community Wireless leader Blair Feulner disclaimed any competition with KUER-FM. In 2000, the transmitter moved from the University Park to the American Stores Tower (later the Wells Fargo Center), part of a major power increase for KCPW. As KCPW and classical music station KBYU-FM eroded KUER-FM's listenership, that station took action. In March 2001, it dropped its daytime classical music programming to add a series of new NPR talk shows, many of which had previously been heard in Salt Lake City on KCPW. Greene justified the decision as a bid to shore up continuing listener erosion as classical listeners switched to KBYU and as providing a more distinctive service statewide. KCPW also protested the change, calling it "predatory" and fearing that duplication among the two stations—of six syndicated programs on weekdays—would harm it financially. The University of Utah moved to shift broadcasts originating from its Hinckley Institute of Politics from KCPW to KUER-FM under its new, more compatible format. When KUER came into direct competition with KCPW, it was able to tap university and state support, as well as its statewide translator network, to sustain itself, putting KCPW at a disadvantage.

In 2004, KCPW moved its studios from trailers at Westminster College to Library Square at the Salt Lake City Public Library, part of an effort to give the station a higher profile and distinguish it from KUER-FM. The Library Square studios, which featured large street-level windows allowing passers-by to see live broadcasts, were one of several moves the station made during the short management tenure of Vicki Mann, who oversaw the acquisition of AM station KIQN (1010 AM) to add coverage of Northern Utah and expanded the staff to eight people in her year running KCPW. The $2.5 million AM station purchase was funded by a bond, to be repaid by the station at $200,000 a year for 25 years, demanding increased fundraising.

Community Wireless of Park City was losing substantial amounts of money by the mid-2000s, largely due to the acquisition of KCPW AM, with losses exceeding $600,000 in 2005 and $413,000 in 2006. At the same time, Feulner's compensation of $150,000 a year exceeded the average of similarly sized nonprofits and other public radio stations. In February 2008, Community Wireless announced its intention to sell KCPW-FM and focus on KPCW in Park City, claiming KCPW deserved management based in Salt Lake City. It gave Ed Sweeney, the station manager, 45 days to form a new non-profit to acquire KCPW.