Here’s a very brief identifier for KBRF “FM103.” Format was automated Top 40. If you listen carefully, you can hear the additional generation of tape noise being added as the cart which contains the spoken ID fires off.
This was recorded from my grandparents’ house in Michigan, North Dakota. Equipment used was a Pioneer AM/FM/cassette stereo portable unit, connected to a “fringe” TV antenna. Source tape is a TDK D90.