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How Close....

I believe it's line of sight but could be wrong. The instant on units are usually triggered when they see a car approaching as to not give any warning should you be using a detector.
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It depends on the Radar unit being used, the terrain, and the profile of the bike. The older, 2002 and back radar guns will clock a broadside bike at about 500yds, a head on bike about 200yds.
The newer units will about double that.
The latest ITT laser gun will clock anything the operator can focus the cross-hairs on!!