St. Louis
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There was also starting in the late 1960s, suburban daytime KIRL. I’m not sure how much of an impact they had but they stayed top 40 until going country in 1977.
I went to high school in St. Charles County. KIRL, which was based near St. Charles, was popular among my cohort. At the time, there were five main public high schools in the county, all but one of them straining from rapid growth. The result: a solid teen audience. There were frequent promotions with local businesses...the I-70 Drive-In in St. Peters had a lot of them...and a little bit of local news and some traffic reports. St. Charles County was beginning to grow in those days, fueled in part by "white flight" from the northern St. Louis County suburbs. It was a popular place for McDonnell-Douglas employees to settle. This put a lot of pressure on the two bridges that crossed the Missouri River between North County and St. Charles County at the time, hence the traffic reports.
KIRL was a replacement station for KADY, which went on the air as the first station licensed to St. Charles in 1958. Shortly thereafter, the KADY owners put KADI-FM on the air, licensed to St. Louis. The stations ran into financial difficulties and went off the air in January 1965. The FM survived but the AM didn't, possibly helped by its St. Louis city of license, though the FCC history cards indicate that it was off the air for much of 1965 and 1966. KADI-FM was sold for $45,000 in November 1965, around the time that Mike Rice of Webster Groves applied for a new station that would replace KADY, which the FCC granted the next year.
KADY(AM) may have had the dubious distinction of being the first station ever fined for not maintaining its tower lights. This happened in February 1966. As the St. Louis Post-Dispatch reported at the time:
An FCC spokesman said it was the first time the commission ever ordered a station to forfeit money for failure to maintain tower lighting.
KADY, while still off the air and about to lose its license, was fined $500.
The new KIRL, broadcasting from the same site north of St. Charles that KADY had used, came on the air August 1968 with a Top-40 format. At first, there were two DJs, Mike Rice, also the owner, and Dave Scott. While the 5,000-watt signal made it into St. Louis just fine, it was still a daytimer. There was some attempt to appeal to St. Louis audiences, but the station's base was really in St. Charles County.
KSLQ(FM) arrived with its Super Q format in September 1972. As mentioned, KXOK was the main victim of KSLQ's success. KIRL was affected as well. Not often mentioned in these discussions, there was also audience loss that resulted from male listeners gravitating toward progressive stations KSHE and KADI-FM. KADI-FM by then was owned by Richard Miller, who owned soul station KXLW(AM).
In late 1972, there was another change: KWK went off the air. After a long license-revocation proceeding in the 1960s resulting from conducting fradulent "treasure hunt" contests, a minority-owned Detroit company was granted a replacement license in 1968. The station changed to R&B, ran into financial difficulties, and went bankrupt. There were two contestants for the KWK license: Doubleday and Bronco Broadcasting, owned by St. Louis football Cardinals players.
Fast forward to 1978. FM was becoming the choice of more and more listeners. KIRL changed its format to country in March 1978. However, that put KIRL in direct competition with Warrenton's KWRE(AM), which had been programming country music since Missouri obtained statehood. While just 1,000 watts, KWRE is on 730 and has good coverage of much of east-central Missouri. I don't know how many listeners KIRL pulled away from KWRE, but I suspect KWRE held much of its audience. Bronco was scouting around for another station to acquire after the KWK license was awarded to Doubleday. Rice and Bronco made a deal. Rice got a tax break for selling to a minority-owned company. Early in 1980, Bronco took over KIRL, programming a black gospel format, which endured for a quarter-century. KIRL is now KHOJ, airing Catholic-oriented programming.
I mentioned KXLW. In 1975, Miller dropped the soul format for a simulcast with KADI-FM. Then, in July or August 1978, Miller put a separate format on the AM station: Top-40. KKOJ, "OJ 13". What timing. I've never heard any explanation for that format change. A possible theory is that Miller saw an opening with the departure of KIRL from the Top-40 format. Just as KIRL was, KXLW/KADI/KKOJ was a daytimer. Fourteen months later, KKOJ became KADI(AM) again, simulcasting the FM as it did before.
The web of connections is notable here: KIRL was the successor of KADY, which started KADI-FM, whose later owner's AM station also tried Top-40 programming; while the company that wanted to own KWK(AM) ended up owning KIRL.
Doubleday's KWK didn't stay Top-40 for very long. It had also bought WGNU-FM, becoming WWWK-FM and later KWK-FM when it won its fight with the FCC to get a "K" call despite a city of license in Illinois. In 1980, it took direct aim at KSHE with an album-rock format. KSHE outlasted KWK, but there was quite a fight between the stations in the early 1980s. Somehow, KADI-FM wasn't nearly as competitive by then.
Disclaimer: I worked summer/vacation relief at KWRE in 1976 and 1977.
KXOK won the St. Louis battle with a far superior signal at 630 and Storz ownership. Was an early casualty of FM when KSLQ came on as a CHR in 1972. Evolved to AC with oldies in 1979 before going talk in 1983.
Actually, here's what happened: in September 1982, KSLQ changed calls to KYKY, promoting itself as "adult rock: between rock and a soft place". Before that switch, the station was an adult-contemporary format with a heavy focus on personalities. That focus continued into change in positioning, though I wouldn't have called it an actual format change. The apparent feeling at the time was that the "Q" identity made people think of the Super Q days that the station had left behind years earlier.