The Zone Corporation announced Monday morning that after 41 years of King’s ownership, Bangor area channels WZON (620 AM), WKIT (100.3 FM), and WZLO (103.1 FM) will sign off on Dec. 31.

The stations—WKIT 100.3, WZLO, and WZON—were set to shut down at the end of last year. But longtime Maine radio entrepreneurs ...