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I am encountering a problem. A monitoring point for an AM station I work for has an increased signal level (twice the norm). Transmitter power is the same it has always been, antenna monitor readings are normal. Of 7 monitor points, only one is high. Adjacent to the antenna field is a heavy equipment company that has metal beams stacked high in the air, maybe 10 to 20 feet high. These heavy equipment seem to be right in the path of the radial that has the increase signal level at the monitoring point.

Any info or suggestions would be highly appreciated.