In the late 70s, as my dad and I drove from Great Bend, KS, to Scott City, KS, I vividly remember hearing KEYN 103.7 from Wichita almost all the way west to Scott City, KS, And this was on an FM converter radio in my dad's small pickup.
180 miles
My own city, where I went to high school, was 79 miles from the transmitter, on the northwest part of the map, right at the station's distant contour.
My best friend's dad told me he regularly heard the station on his business drives between Dodge City and Garden City, KS, (left side of the top map), 170 miles.
The transmitter is on a 1,000' antenna.
There are 2 TV stations in that same area, 3 & 10, neither are received via antenna in Great Bend, so the purple line is likely the limit (then) for TV signals. I do know those stations are receivable in Pratt (west side of map), which is similar distance from the transmitter.