840 AM
The following radio stations broadcast on AM frequency 840 kHz:WHAS in Louisville, Kentucky is the dominant Class A, clear-channel station on 840 AM, which is a United States clear channel frequency.
...
Wikipedia
The following radio stations broadcast on AM frequency 840 kHz:WHAS in Louisville, Kentucky is the dominant Class A, clear-channel station on 840 AM, which is a United States clear channel frequency.