WPPN 106.7 and WPWX 92.3 in Chicago

[ftballfan]

There is a lot of short spacing in the Great Lakes area.
A newish example is 106.9 in the Milwaukee area being short-spaced to 106.9 in Muskegon. The Milwaukee 106.9 (Class A) signed on well after 1964 yet is still allowed to be short-spaced to Muskegon (a 50kW Class B). Normal spacing between a Class A and Class B co-channel is 111 miles, while these two are only 97 miles apart.
94.5 in Holland (Class B) is short-spaced to two 94.5s, Milwaukee (Class B) and Mt. Pleasant/Tri-Cities (Class C1). All three of these signed on before 1964.