Radio: Wild West

KFBB, the radio station at Great Falls, Mont., is the kind of broadcasting station that U.S. radio-network executives envy. Almost all of its programs are heard by almost all of its audience. The reason for this idyllic situation is that KFBB's territory has one basic interest — the weather — and that KFBB has been sharing that interest for 22 years. As a result, most receiving sets in Montana's 15 north-central counties (about the size of the State of New York) were tuned last week, as usual, to KFBB.

Sheepherders in their covered...