Why Microwave stations typically use dish or horn antennas with very high gain, which concentrates the transmitted power into a narrow beam. Power density in that beam can be hundreds of times what the same transmitter would produce with a dipole, so the MPE limit can be exceeded close to the antenna even at modest transmitter power. Exposure evaluation at these frequencies has to account for antenna gain and the main-lobe direction, especially in the near field of a large dish.
Watch out The claim that microwaves are ionizing is wrong: ionizing radiation starts in the ultraviolet and above, and all RF, including microwaves, is non-ionizing and causes harm by heating tissue instead.
Microwave risk = gain, not ionization. A dish focuses the beam, so stay out of the front of it.