ktgm signed on the air in 1987, broadcasting on ntsc analog channel 14. it was guam's second commercial tv station after kuam-tv had signed on 31 years prior, and the first tv station of any kind on guam in nearly 17 years since pbs member kgtf's sign on. it has always been a primary abc affiliate, but in the beginning also had a secondary cbs affiliation, which it shared with kuam-tv. it added fox programming in 1990, after being dropped by kuam-tv. cbs was dropped in 1995 after kuam-lp signed on. fox was dropped as well by the end of the 1990s, shifting its focus to abc programming, after which fox was only available on cable via san francisco bay area affiliate ktvu until 2005, when keqi-lp picked up the affiliation. between june 2001 and november 2005, ktgm also carried wb programming (previously carried by kuam-lp).