On January 7, 1964, Conroy sold KTVO to the Post Corporation, a media conglomerate of newspapers and broadcasting properties based in Appleton, Wisconsin. The new owners renovated and expanded the KTVO facilities in Ottumwa, shared for the station's first twenty years with then co-owned KBIZ-AM 1240. On June 1, 1968, KTVO switched primary affiliation to ABC, although the station continued carrying a few CBS and NBC shows until 1974. The year 1976 brought great change to KTVO. The Post Corporation received FCC approval to erect a new tower near Colony, Missouri. This new height and location would allow KTVO's signal to reach the lucrative Quincy, Illinois–Hannibal, Missouri DMA while still serving its two original cities of license. As part of the upgrade KTVO's main studios were moved from Ottumwa to a newly constructed building three miles north of Kirksville, with a secondary studio remaining in Ottumwa and a news bureau to be established in Quincy. With more room to grow in their new Kirksville facility, in the early 1980s KTVO operated a short-lived, low-power UHF station, K40AI, channel 40. A large bulk of K40AI's schedule was made up of programming from the now-defunct Satellite Program Network. K40AI also re-purposed a small amount of the syndicated programming aired on KTVO at the time, such as "Solid Gold". In 1984, Gillett Corporation bought the Post Corporation Stations; however, due to the Federal Communications Commission (FCC) ownership limit of five VHF television stations that was in effect at the time, KTVO was spun off to a local telecommunications company called "Gillbro Communications". Federal Broadcasting (later Federal Enterprises) acquired the station in 1987.