Get on the range vox, tell everybody to "talk it up, give reports, tell us where they are", and lead by example. I try to do this, and sometimes it helps. Sometimes it doesn't.
We all get sick of being some countryman's "bait biotch", and I call them on it when I catch them at it.
But the one thing I really HATE is the "High Spit" or "LA-7 low" or "there's a GV over here" calls. High where? Over where? You know what I mean.
A lot of newbies don't try to communicate, but they learned that behavior from the old hands.