930 kHz 

The AM frequency of 930 kilohertz is defined by the FCC as a Regional Channel Class B or D frequency.  In Idaho, KSEI is the only station on 930.  Across the US, however, there are over 50 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)