Antenna measurements are significantly affected by the environment. Therefore, the measurements are usually carried out in precisely constructed anechoic chambers which are covered with absorbers to create an interference-free and high-quality test zone. However, this is associated with high costs. Hence, intensive research is being conducted on echo reduction methods to be capable of performing antenna measurements with reasonable accuracy also in low-quality test zones. An accurate technique will consequently not only reduce the costs but also the complexity of the facilities as the...