He owned his own record label, Karl Records, in which he released records by rockabilly recording artists such as Ray King, Bo Ratliff, Little Dickie Chaffin, Archie Poe, Von Stephens, Deacon Morris, and Larry Edwards. The label was based out of Springfield, Ohio. Eager appeared on radio stations WFTW out of Fort Wayne, Indiana and WLOK out of Lima, Ohio in 1950.
In addition he also worked as a DJ and Program Director at WHOK in Lancaster, Ohio.
He also appeared on radio shows Renfro Valley Barn Dance and Midwestern Hayride on World's Largest Wireles out of Cincinnati, Ohio in 1951.