What should be done if evaluation shows that a neighbor might experience more than the allowable limit of RF exposure from the main lobe of a directional antenna?
Change to a non-polarized antenna with higher gain
Use an antenna with a higher front-to-back ratio
Take precautions to ensure that the antenna cannot be pointed in their direction when they are present✓الإجابة الصحيحة
All these choices are correct
الشرح
Power density in the far field falls off with the square of distance and scales with antenna gain in the direction concerned, so a directional antenna's main lobe is where the highest exposure occurs. Keeping the main lobe away from an occupied area while it is occupied brings exposure at that location down.