What should you do for safety when operating at UHF and microwave frequencies?

UHF and microwave frequencies have very short wavelengths that can be readily absorbed by human tissue, causing localized heating. The eyes are particularly vulnerable to this RF heating because they lack a strong blood flow to dissipate the heat, making it crucial to keep antennas away from them during transmission. Other options, such as low SWR or RF leakage filters, address equipment performance or theoretical setups, not the direct biological hazards of RF exposure. Antenna polarization has no impact on safety.