Four years later , KGUM began using the name News Talk K57 .
K - 57 Radio bought the station in 1981 , relaunching it as K57 Radio with the new callsign of KGUM .
Four years later , K - 57 Radio began using the K - 57 Radio K - 57 Radio     .
K - 57 Radio bought the station in 1981 , relaunching it as K57 Radio with the new callsign of KGUM .