We have two conservative radio options in the Twin Cities - the Salem station, which offers the Bennett/Gallagher/Prager/Medved/Hewitt lineup, and the Clear Channel station, which offers local (former gov candidate Tom Emmer/Beck/Limbaugh/Hannity/Lewis lineup.
Until a few months ago, the Clear Channel station was FM, on a powerful bandwidth and high wattage tower. The Salem station has always been AM.
The CC station inexplicably traded with the local AM sports programming station. Now the conservative CC station can barely be heard in some parts of the metro, and certainly not far out of it.
They received many complaints, to no avail. From a pure free market perspective, that would indicate that either the ratings weren't there to justify the strong FM signal, the sports station was in higher demand, the conservative programs do well enough to suffer the reduced coverage, or some combination of those.