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Levels of energy from RF waves near cell phone towers are not significantly different from the background levels of RF radiation in urban areas from other sources, such as radio and television broadcast stations.Studies in people Very few human studies have focused specifically on cellular phone towers and cancer risk. However, such high levels are found only near certain equipment, such as powerful long-distance transmitters. Operation. Mobile towers are especially dangerous because they emit microwaves at a frequency of 1900 MHz. There is often local opposition to new masts for reasons of safety and appearance. (This is the basis for how microwave ovens work.) But the levels of energy used by cell phones and towers are much lower. The renewable energy systems supply electrical power when available.