WJKR (103.9 FM) is a commercial radio station licensed to Worthington, Ohio, and serving the Columbus metro area.

Owned by the North American Broadcasting Company, Inc., its studios and offices are on Dublin Road in Columbus.

Its HD2 subchannel plays adult contemporary music and feeds FM translator W231EG at 94.1 MHz.

Prior to this station's establishment, the 103.9 MHz frequency in the Columbus market was occupied by WBBY-FM, licensed to Westerville, Ohio.

It was found that the majority owner/station manager withheld details to the Federal Communications Commission (FCC) about his level of involvement in a Marietta, Ohio car dealership.

In September 2005, the station's owners added the Indianapolis-based syndicated Bob & Tom Show for morning drive time.

[7] WTDA was one of four radio stations in the Columbus market to have a Classic Hits/Oldies format, joining Newark-based WNKO and the WNND/WNNP "Rewind 103.5/104.3" simulcast.

On June 14, 2012, WTDA flipped to an all-news format, changing the call letters to WMNI-FM.

The simulcast ended on Thursday, July 18, 2013, when WMNI returned to the adult standards format.

On July 24, 2013, WMNI-FM changed format to adult hits, subscribing to the JACK FM service.