David Eduardo wrote:

In addtion, exact postion is a 100% foolproof credit; a rounded postion can
throw diary entries into ascription. Thus, exact frequency on-air mentions.

There is the occasional exception to the rule too. I know of one station
that was IDed at 101.9, then became K102, then went back to 101.9 (same
basic format with a re-tweaking each time.) There were also 102.3 and 102.7
stations in the same market. Go figure.