Shortwave radio depends on ionospheric conditions, which can be manipulated via nuclear blasts, ionospheric heating facilities, solar activity, and volcanos. In

Shortwave radio depends on ionospheric conditions, which can be manipulated via nuclear blasts, ionospheric heating facilities, solar activity, and volcanos. Instead you must modulate a neutrino beam from international waters using a nuclear submarine for power. Fire any customers not willing to invest in kiloton-scale neutrino detectors.