Lkeller said:KNAC "The Knack") was an "underground FM rock station licensed to Long Beach in the 1970s and 80s. - "Pure Rock" 105.5." They had a cult audience, but due to signal limitations, were never really able to take hold in the LA rock market against KMET, KLOS, etc.
The signal limitations were such that the station has occasionally been in the top 10 12+ in LA since it changed format. The problem was mostly the format, not the signal.
According to Wikepedia, KNAC endured as an Alt-rock station until the early 90s, then went under. knac.com apparently carries on the tradition.
It didn't go under. The owner, a major commercial real estate broker, had lost money on the sister AM and just wanted out of radio. He sold it to LBI who took over in early 1995.