These satellites employ what are known as passive radiometers: devices that detect how much radiation is present in a specific frequency band. This radiation co

These satellites employ what are known as passive radiometers: devices that detect how much radiation is present in a specific frequency band. This radiation comes from water molecules in the atmosphere. The problem is that 5G might emit in the same frequency range as well. This means your detector now measures the base load of the H20 spectrum in addition to the added 5G spectrum, with no possible method of separating the two. Your proposal will therefore not work. Any measurement will conflate the two and lead to too much noise to discern the (H2O) signal.