I've been advised, and confirmed in flight yesterday, the low sector frequency for Sioux City, IA area is now 128.0. The frequency 124.1 is no longer in use. Asking the controller yesterday I was told the site is the same location but they combined two sectors (Sioux City and O'Neil) into one.
I will be updating my scanner when I get home tonight. Please update the KSUX page removing 124.1 and adding 128.0