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I aim for the "sweet spot" about 6" above the the sensor. I always use the screens. I modifed mine to accept wood dowels and I marked the dowels with black marker for the sweet spot. There are marks at 4" 6" and 8". the center one being broader than the other two. If your still using the metal rods you can mark them with electrical tape. The measurements are measured virticle not diag. on the rod.
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