As far as I know, there were no Wichita stations knocked off for any significant length of time. The main transmitter farm is located northwest of town, and the tornado tracked through the south and east areas of town. I think 100.5 is about the only station with a transmitter around there, and it's actually to the east of town about halfway between Augusta and Wichita.
I'm not sure about outstate Kansas as there were definitely tornadoes outside of Wichita, too.