KSBN had a clear and loud signal at 14:05 UTC on November 9, 2006 during LEM234. It was also easily seen on the SDR-14/Spectravue spectrum since the station operated badly off from it's nominal frequency. The correct frequency was 1229.929 kHz so KSBN was totally 71 Hz under it's nominal 1230 kHz. Actually most of the stations in the US and Canada are more or less off from their offical frequencies.
KSBN "Moneytalk 1230" verified with a kind e-mail message and the v/s wrote that KSBN is the oldest radio station in Spokane signing on the air in 1921.