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It actually alerts to both the antenna and the head unit. When the antenna was in the center of the dash I got a forward KA alert. I moved the antenna and now it alerts with a an intermittent rear KA alert. I have tested just about everything and the one constant is; XM head unit on - alert. XM head unit off- alert stops.
Just for giggles, open the window and stick the antenna on the roof to see what happens. Signals bounce all over the place inside a car so I wouldn't trust the arrows in this kind of situation.
Brick, you hit the nail on the head. I actually called Valentine and spoke with tech support before I read your email. He said the same thing you said. Also said they had known about this situation for over a year; that the satellite antenna can cause falsing even if mounted outside but near the detector. I have it over to the driver side door on the roof and no more falsing.
thanks everyone for the input.
Mike