I have had allot of experience with outdoor detection. Which I'm sure I'll
get flack for...but here's my two cents anyway. I did a outdoor pool complex
where I put Optex VX-40's (about 30 of them) scattered around the perimeter
of a fenced in area with great success. And more importantly no false
alarms. I mounted them on 2" Rigid Pipe at about 3' high. I also kicked on
500 watt quartz lights to light up the area in the dark. The pool was
experiencing vandalism, up until the time of install. I did another large
job using ProTech outdoor detectors, again very reliable, but in my opinion
costly. I have used both Crow, and Sentrol detectors, which in my opinion
are both junk. Photobeams work good too, and a mixture of both.
Jack