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[Puck]

Just out of curiosity, after you put it on the soffit, how far was it's range then.  I guess that would be the sensors top to bottom range at that point.

With it pointing downward on a slight angle, it completely covers my front door area and an adjacent basement window. I haven't measured the actual triggering area since it covers what I want, but I'm estimating it covers about a 15 ft radius. FYI: I have the top part of the motion sensor facing the opposite side of the wall (bottom of sensor towards wall). With this configuration I was able to better limit the area coverage out from the wall by mounting it with a slight angle using wooden shims. I also use Velcro for easy dismounting for battery replacement ( Thanks Dave_x10_L  ).

[svcguy]

I like the Velcro idea 

FWIW, I ended up trying my aluminum soffit and was not able to get RF reception on the CM15A (F-connector mod and quarter-wave ground plane antenna in the basement).  I then went to a small section of wall on the front porch perpendicular to the first wall I tried.  So far, so good.  It will most likely ring up cars going down the driveway (and my neighbor's as well), but I'll see how it does there for now.

Thanks for the help, Puck, +1 to you 

Andy