Ground wave propagation- A radioactive that can travel directly from one point to another following the surface of the earth is called a ground wave.And this type of wave propagation is called ground wave propagation.

Space wave propagation-If a radioactive transmitted from an antenna, travelling in a straight line, directly reaches to receiving antenna, it is called space wave.The space wave propagation is also called line of sight propagation.

Sky wave propagation- If a radioactive directed towards the sky and reflected by the ionosphere towards the desired location of the earth is called sky wave, and this propagation is called sky wave propagation.