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?

Directional antennas focus RF energy into a specific path, creating a 'main lobe' with significantly higher effective radiated power (ERP) than other directions. If your exposure evaluation shows that this main lobe exceeds the Maximum Permissible Exposure (MPE) limits for an uncontrolled environment (such as a neighbor's yard or house), you must take immediate action to protect them. The most effective and required mitigation is to ensure that the antenna is never transmitting in their direction while they are present. This can be achieved by physically restricting the antenna's rotation or by adopting strict operating protocols when neighbors are at home. Changing to an antenna with a higher front-to-back ratio does not solve the fundamental problem, because the excessive RF energy is coming from the front (the main lobe), not the back. The core rule of RF safety is managing actual human exposure.