A majority of shortwave stations are engaged in propaganda of some form or another, beaming a message across international borders. The US has multiple operatio

A majority of shortwave stations are engaged in propaganda of some form or another, beaming a message across international borders. The US has multiple operations covering the Middle East, Asia, the CIS and Central America, most of which were historically funded and controlled by the CIA. https://en.wikipedia.org/wiki/Radio_Free_Europe/Radio_Liberty https://en.wikipedia.org/wiki/Radio_Free_Europe/Radio_Libert... https://en.wikipedia.org/wiki/Radio_Free_Asia https://en.wikipedia.org/wiki/Radio_Free_Asia >The station now uses more than 100 radio antennas located in countries all around China, such as Thailand and Taiwan, which trade the signal — in effect, playing a game of keepaway with the station’s broadcasting. Shortwave broadcasters change transmitter sites and frequencies throughout the day as a matter of routine, because the atmospheric conditions that allow shortwave signals to travel beyond the horizon are constantly changing. Most modern shortwave transmitters are steerable and frequency-agile, so they can be reconfigured in a matter of seconds to provide the optimal coverage of the target area. Efforts to evade jamming are really just an extension of the normal operation of a shortwave station. https://en.wikipedia.org/wiki/Skywave https://en.wikipedia.org/wiki/Skywave https://en.wikipedia.org/wiki/ALLISS https://en.wikipedia.org/wiki/ALLISS It's surprisingly difficult to jam a shortwave station within your own borders due to a phenomenon called beam skip - at typical frequencies, there's a large gap between the line-of-sight coverage area of a transmitter and the longer-range signals that bounce off the atmosphere. It's just about viable for a country the size of China, but it would require multiple overlapping transmitter sites and would be unlikely to provide consistent jamming. https://en.wikipedia.org/wiki/Skip_zone https://en.wikipedia.org/wiki/Skip_zone