A little more on this. . .
From time to time, transmitters go off line for some reason or another. So here at home, I'll scan both the Fairgrounds and Shepherdsville towers, just so I don't miss something. The Fairgrounds tower has gone off line a few times over the years.
When I'm mobile, all the towers are being scanned, but with location control going so I'm listening to just the local post, more or less.
The database is a little "peculiar" to me, though I'm sure there is a reason for it. The location and ranges are for a Post's coverage area. So if I'm in Shepherdsville near Bernheim forest, the database has my scanner trying to receive the Morgantown/Butler County tower, which way too far away. However, I can be looking at the Bernheim KSP tower which also has Post 12 on it, but because I'm not in the Post 12 area, my scanner won't attempt to receive that Post 12 frequency.