KSOO Sioux Falls, South Dakota would sometimes sneak through the co-channel din atop on 1140 with a readable signal in Spokane like they did in November 1977. They replied with this QSL letter for my reception report.

In August 2017, KXRB and KSOO swapped frequencies. KSOO moved to 1000 with its NewsTalk format, and KXRB moved to 1140 with its Country Music format.