A quarter-wave antenna is an antenna that is grounded on one side and tuned to one quarter of the wavelength
. This means that the length of the antenna is one quarter of the wavelength. The antenna length of a quarter-wave antenna would be 3.75 cm assuming a frequency of 2 GHz, which corresponds to a wavelength of 15 cm. The quarter-wave antenna is also known as the Marconi antenna. It is omnidirectional in its radiation pattern, which means it radiates evenly in all directions. The quarter-wave antenna is the shortest antenna that can be used effectively in radio communications.