Chevvron - teach them the contents of the AIP section I quoted, during the Comms part of the PPL/CPL/ATPL, and airfields wouldn't have to publish them in the first place!
Come on - Which part of "Line of sight" and "Finite number of frequencies" is so difficult to understand?
This should be required knowledge, which shouldn't need to be published on the plates as it's the same everywhere.