WKBI-FM (93.9 FM, "B94") is a Top 40 (CHR) music formatted radio station based in Saint Marys, Pennsylvania.

It is owned by Dennis and Rose Heindl, through licensee Laurel Media, Inc. WKBI-FM has since its inception, been the sister station of WKBI (AM), which first went on the air back in 1950, and had been the first station built as part of the Allegheny Mountain Network.

The call letters were representative of the famous cowboy of the silver screen, Tom Mix.

Former DJs include, Erik Lane (now at WKVA), Nancy Kelley, Zack Williams (now at ENERGY 92.1 WMYB Myrtle Beach), Joe Disque, Jesse Davis, Jonny Ryan, Rich Thomas, Stephanie Rae, Jennifer Lee, Ally O'Neil, J.B. Savage (who left to work for Cumulus in Albany, GA) Shannel Huston, Taylor Jordan, Tim Allen, Terry Long, Matt Stone (known as Matt Matthews on WKBI, now at KRUZ-FM in Santa Barbara), A.J.

Some of the DJs who worked there during the 1970s were, "Disco Joe Thompson", "Stubby King", Ken Hoff, Angie Fararri, Dean Paige, Rick Porter, Tom Rogers, Mark Benson, Mike McClain who was hired on January 31, 1977 at the age of 14, Keith McKervey, who left the radio station to pursue a position with the popular "Up with People", Ken Ciroli, Ray Rettger (A.K.A.