As KJJY, the station slowly built a following taking on the market's current country giant KSO, which had been the market's country leader on the AM band since 1972. KJJY also fended off a challenge from KKXI in 1986, asserting its dominance in the FM country market. To further compete in the market, KJJY moved to 92.5 (MHz) in 1988 and received a power upgrade to 50,000 watts. The 106.3 frequency went silent at this time.
Sunny 106 was never a top performer in the market, not once beating main rival KLTI-FM. On October 1, 1999, the calls changed to KLYF while keeping the adult contemporary format. The thought was to bring back a historic name to the market in hopes of turning around the station's fortunes. In the two years that the station was KLYF, it did quite a bit better than KYSY, but still never lived up to expectations.
After the failure of two AC formatted stations, Clear Channel decided to go in a totally different direction and bring the Des Moines market a format it had never had before, smooth jazz/new adult contemporary. The change was made on September 4, 2001. The new calls were KVJZ and the station was known as "Smooth Jazz, V106.3". Much like when the station was KMXD, this format never attracted huge numbers, but had a loyal following. In the end, though, that following was not enough to keep the station from changing formats again.
This format did moderately well on the station, picking up a very loyal fanbase while also maintaining decent ratings. On May 25, 2006, sister station KMXD started simulcasting The Bus and became known as "100.3 and 106.3, The Bus". This arrangement was short-lived, and at noon on June 12, 2006, the KDRB calls and "The Bus" format migrated solely to 100.3, replacing KMXD. The 106.3 FM frequency became KPTL, "Capital 106.3", programmed with an adult album alternative format. KPTL is the first triple-A station in Des Moines since the demise of KFMG in 1996. (KFMG was resurrected on a low-power FM station at 99.1 FM that signed on February 26, 2007; it also has an adult album alternative format).