The effect of the radiation footprint on the ground can be seen from Figure 2.16,
where the distance between the radiating source and the ground surface has been
increased from 0.1 m to 0.5 m (left to right). The ground area is 2 m by 2 m and it can
be seen that the width of the 3 dB footprint increases considerably as the source is
raised from the ground. The effect of this on the image resolution is also considerable
as the convolution of the antenna pattern with the target causes a blurring of the target
image as shown in Figure 2.17.