Dial swapping

I didn't chase it down last night but I wondered at the time. Why is WHB now at 810 on the dial? Wasn't it 710? It was. KCMO and WHB swapped positions.

I suppose there's a whole essay on dial positions somewhere. Time was the low numbers (really low) were country music. Now they're half the range, or so it seems when we randomly search when we're on the road again.