It was owned by Sorensen Media Group and operated by Lilly Broadcasting alongside low-power Fox affiliate KEQI-LD (channel 22).

The two stations shared studios on 111 Chalan Santo Papa in Hagåtña (Agana); KTGM's transmitter was located in the heights of Barigåda (Barrigada).

KTGM signed on the air at 7 p.m. on October 29, 1984,[2] owned by Guahan Airwaves, with facilities at the Atlantica Guam building in Upper Tumon,[2] under the callsign K14AM.

Initially an independent operation carrying multilingual programming to cater to the island's diverse ethnicities in addition to hoteliers and telecommunications workers,[4] as well as classic movies in English,[2] in July 1985 it started adding CNN programming in late August 1985 after an agreement signed in early July.

[8] The pre-existing format as a news channel began to pose economic challenges, as advertising sales were proven to be insufficient.

[20] On February 18, 2025, Sorensen filed with the FCC for cancellation of the licenses for KTGM and sister station KEQI-LD; no reason was given for the move.

[21][22] Because Guam is a day ahead of the continental United States and that most programs arrived by tapes from California, KTGM used to air most ABC shows (except those available through satellites) on a one-week delay basis.

When KTGM carried WB programming, it was aired from 6 to 8 p.m. directly before ABC's prime time schedule, also on a one-week delay.

The PNC TV news was broadcast live nightly at 6 p.m., then rebroadcast on KEQI-LD at 7 and 10:30 p.m., as well as on KTGM after ABC prime time programming at 10 p.m.