Compare when the US built Greenbank they wen the other way with the National Radio Quiet Zone (NRQZ) https://en.wikipedia.org/wiki/United_States_National_Radio

Compare when the US built Greenbank they wen the other way with the National Radio Quiet Zone (NRQZ) https://en.wikipedia.org/wiki/United_States_National_Radio_Quiet_Zone https://en.wikipedia.org/wiki/United_States_National_Radio_Q... > The Observatory polices the area actively for devices emitting excessive electromagnetic radiation such as microwave ovens, Wi-Fi access points and faulty electrical equipment and request citizens discontinue their usage. Things like only diesel vehicles (at the time, curious if electric cars are allowed now) because regular combustion engines have spark plugs. I also remember watching a program (NOVA?) where they were interviewing one of the people who as charged with identifying sources. Often they were faulty transformers on electric poles (which got fixed). One time it was a woman's elderly dog that had a heating pad that was noisy (that one he went out and got new heating pad and that cleared it up).