Yes and no.
You can't argue with the science behind it, but it's debatable whether it helps you at all.
It seems that the range at which you can detect the camera is increased slightly, but even so, the numbers I have seen from a quick search show that even with the detector mounted parallel to the roadway you get warning before you enter the capture (photo) zone.
Check this out:
http://www.youtube.com/watch?v=dXMCB...eature=related
And some interesting info:
http://radartest.com/article.asp?articleid=5000
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