 The microwave beam intensity at ground level in the center of the beam would be designed and physically built into the system; simply, the transmitter would be too far away and too small to be able to increase the intensity to unsafe levels, even in principle.In addition, a design constraint is that the microwave beam must not be so intense as to injure wildlife, particularly birds.Experiments with deliberate microwave irradiation at reasonable levels have failed to show negative effects even over multiple generations.