Six months ago renters moved in house down the street. Never wave back or smile. Very serious looking folk. Beat up cars and large dogs on chains near front door. They never seem to ever leave. Soon after they moved in, every time drive by get a huge RF burst that pegs the 7800. No other homes gave such a signature. XYL thinks they're up to no good. Perhaps. Are there innocent explanations or, more to the point, what could it be if less than legal means. High frequency growing lights? Or? Thanks.