Sprayer boom height?

You want the top of the target weeds to be just about the same height as to where your spray from each nozzle overlaps. If the weeds are taller than that...you miss some....if your way above that you risk drifting and the like.
 
Sagittarius and j-bird got it right, about 20", start spraying and watch to make sure there's just a little bit of overlap where the flat mist fans hit the weed tops.
 
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