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Not quite the same, but I worked at the late, great WDGY in Minneapolis back in the early 80s. 50kW AM station that cut to 25kW at night with a VERY tight directional pattern. There was a baseball field about 1/4 mile from the transmitter site...right smack in the middle of the main directional lobe. Even at 25kW, the ERP in the main lobe was over 500kW. The filaments in the ballpark lights would dance to the music during night games due to the intense RF field. You could walk around inside the station with a fluorescent tube in your hand and it would be lit. Fun!!
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