Radio waves have frequencies between 10 kHz and 1 gigahertz. The range of electromagnetic spectrum between 10 kHz and 1 GHz is known as radiofrequency (RF).
Radio waves are omnidirectional. When an antenna sends radio waves, they are propagated in all directions. This defines that the sending and receiving antennas do not have to be aligned.
A sending antenna sends waves that any receiving antenna can receive. It is based on the wavelength, strength, and purpose of transmission. There are various types of antennas, as display in the figure.
Radio waves are those waves that propagate in the sky mode, can travel long distances. Radio waves are those of low and medium frequencies, can penetrate walls. Thus an AM radio can receive signals inside a building also.
Radio waves are effortless to generate, and they can travel a long distance. Due to these reasons, they are broadly used for indoor and outdoor communications. These are the waves through which your walky-talky sets and radio operates.
Following are the advantages of radio transmission −
Following are the disadvantages of radio transmission −