After the second world war, the military radio equipment, and since before the second world war, other than the sailors and the experimenter almost without any purpose, because it is the nature of the unreliable, so there are very few radio management using laws, mainly based on the concept of "non-interference" in the national boundaries. One aspect is that you can do whatever you want as long as it is limited to your property.

The result is a mess, still in many parts of the world.

This confusion is mainly in industrialized countries is considered to be unwelcome, individual countries select authorization/allows broadcasters to work each other, so under the auspices of the United Nations, the itu has frequency signal jammer plan and other standards, in order to achieve a certain degree of harmony in the itu area.

Brought a change in the 1960 s, however, in the UK, Harold Wilson to condemn his lack of political success in coast "pirates" part of the reason (he later accused of mi5 and other "security department"), when he gained power, he will be one of the "Marine laws", this is a draconian laws, it actually allows the British government in violation of international law on detention and sales/destruction at home or in international waters in pirate radio or support any ship of pirate radio, and prosecute anyone involving pirates to offer goods, services or income, and through these laws, it changes the current law and other laws and regulations, one of them is the method of wireless telegraphy, these changes as the foundation of many other countries legislation later.

https://www.jammer-buy.com/mini-car-gps-jammer-sale-cheap.html