Claim: KACH(1340 kHz) is a radio station broadcasting a Classic Hits format to the Idaho, United States area that first aired on 6 September 1948.
Evidence: KACH (1340 AM) is a radio station broadcasting a Classic Hits format to the Preston, Idaho, United States area. 1340 kHz The station signed on the air September 6, 1948, as KPST. 
The station signed on the air September 6, 1948, as KPST. 1340 kHz Preston's Classic Hits Preston, Idaho Classic Hits