980 kHz 

The AM frequency of 980 kilohertz is defined by the FCC as a Regional Channel Class B or D frequency.  In Idaho,  KSPZ is the only station on 980.  Across the US, however, there are over 45 stations assigned to this frequency, several in Canada, and several  in Mexico and other North American areas.  It is for this reason stations on this frequency either reduce power or switch to a directional antenna (or both) at night to reduce interference.    (Information updated February 2008