I also have to suspect things like isolated, dedicated and redundant comm links with the flight termination system are part of these guidelines. Perhaps even a "dead man's switch" that terminates the flight if this separate communication system loses signal at some point. (Even if this means a costly false positive or two~)
For the Space Shuttle, the flight termination system had two huge 10KW transmitters to send the signal. That would get through despite damaged receiving antennas, noise, or jamming.
Less than the typical TV or FM broadcast tower, and remember there's a lot of empty space around the launch sites. Even ham radio operators in the US can run at 1.5kW peak.
