"Header", "liner", "sweeper", "drop" are all real insider terms. I, for one, have no idea how they differ, if at all, from each other. Worse, I'm not sure what they mean.
I am technically an outsider too and can only guess what they all mean. For example is a sweeper short for a radio contest?
Focusing on a bigger market and doing what they can to reach it ...WEEI-FM Lawrence, the best sports station in the Merrimack Valley!*
*--studios Boston, stick Peabody