They must run off of some kind of script or at least a sheet of talking points.
Here in Portland Oregon, there show is on 1190KEX and ends at nine in the morning.
After it's over, I change to 101.1FM and listen to a show called Markley and VanCamp.
Markley & Van Camp Show - KXL
They go over almost the exact same stuff, sometimes even the same jokes, but the show is geared more towards Portland.
It's very eerie on how similar the shows are, it can't be a mistake or coincidence, it happens every day.
Personally, I find Armstrong & Getty way too silly and cornball, and really don't like them that much.