He's saying it
should be a K, not a W, because Fort Collins
is West of the Mississippi. It probably indicates how old the station is.
"In 1912, several countries attended
a conference to discuss international radiotelegraphs. One of the things that came out of that meeting was the assignment or specific letters to identify each countries radio and television signals. The United States was given the letters W, K, N, and A.
The letters ‘N’ and ‘A’ were given to military stations, but ‘K’ and ‘W’ were assigned out for commercial use. Radio stations east of the Mississippi River had to start their stations with ‘W’, and stations west of the Mississippi with ‘K’. There is some discrepancy though since radio stations that already existed before this rule was put in place weren’t required to change their name."
Around here they are all K's.