WHKO

In 1946, the station signed on as WHIO-FM, the first FM station in Dayton and one of the first in Ohio.[5] In its early years, it simulcast co-owned WHIO; as network programming moved from radio to television, WHIO-AM-FM switched to a full service middle of the road format (MOR) of popular music, news and sports.[6]

In the 1960s, WHIO-FM switched to its own programming, a beautiful music format. It played quarter-hour sweeps of instrumental cover versions of popular songs, along with Broadway and Hollywood show tunes. As more people acquired FM radios, WHIO-FM was the top-rated station in the Dayton market for many years, playing reel to reel tapes of beautiful music provided by Bonneville International in Salt Lake City. It used a "live assist" system, where announcers listed the songs and gave news briefs and weather updates, but only talking briefly between the music.

In the 1980s, WHIO-FM's audience began to age, even though the overall ratings were strong. The 25-54 demographic, most sought after by advertisers, were slipping, so management decided to add more modern vocals, in an attempt to find younger listeners. Songs from The Eagles, Stevie Wonder, Carly Simon and Jim Croce were added. When this tactic failed, Cox Broadcasting decided to research the market for a format that Dayton listeners would respond to. Many easy listening and beautiful music stations evolved into soft adult contemporary stations. But with WVUD 99.9 already in the soft AC format as "Delightful 100FM," Cox opted to instead change the format completely.

On March 17, 1989, the station switched its call sign to WHKO, and the format abruptly changed from easy listening to country music. This was unexpected since the 12+ overall ratings still had WHIO-FM as the #1 station in the market. The last song played on WHIO-FM was Rick Astley's "Together Forever." The station then flipped to country music, although the announcer pre-sold another 30 minutes of easy listening favorites. The first song played under the new format was Barbara Mandrell's "I Was Country When Country Wasn't Cool". The first announcer on the station was Jim Manley who at that time moved from WHIO 1290 AM to mornings on the new K99.1FM. Nancy Wilson joined Manley short time later as co-host.

The previous format's audience, mainly older listeners, were very unhappy about the format change. The station received hundreds of complaint letters and numerous phone calls demanding to know why "FM 99" was playing country music. But after 2 ratings periods, K99.1FM was back to its number one ranking in its target demographic of 25-54. Prior to the switch, the top-rated country station in Dayton through the 1970s and 1980s was WONE, which switched to an adult standards format.

At first, WHKO was "easy listening country", playing more soft crossover hits from Kenny Rogers, Linda Rondstadt, Rita Coolidge, Gordon Lightfoot and other soft rock and adult contemporary artists with a country background. The disk jockey style was laid back, at times sounding almost like the previous easy listening format. Over the next several years, the station slowly modernized the format with tight rotations, upbeat DJs and community involvement.

WHKO is the Dayton Children's Radiothon station the market and has raised over $4 million dollars since 1998.[7] WHKO won the National Association of Broadcasters Crystal Award in 2018 for outstanding community service.[8] WHKO was only one of eight stations receiving the award. WHKO has also been nominated for several Academy of Country Music and Country Music Association awards.[9]

In November 2006, the WHIO-FM call sign returned to the Dayton area at 95.7 FM in Piqua (formerly WDPT) as a simulcast of WHIO's news/talk format. The 95.7 facility had previously sought to capture the original WHIO-FM's audience when it abandoned the beautiful music format, converting from WPTW-FM to "Clear 95" with the call letters WCLR.