On Mon, 16 Jul 2007 20:58:23 GMT, "Bob Loblaw"
wrote:

STL = Studio-Transmitter Link
These things were never meant to be heard except by a receiver located at
the transmitter site.
Broadcast Auxilliary Service stations are usually not STLs. Since the
FCC mandated obscenity delays took over, some News Talkers now
require a non-delayed foldback channel to cue the field reporters
live, over the air, as it were. I think most of the 26 mHz stuff is
techically licensed for Inter City Relay.