You might be on to something here with the focused optics analogy. I read in the download for the user's manual that the Magnacast 5000 is able to set the locating range--each setting is for a particular distance (in ten-meter sections). That appears to be some sort of focusing. Of course any waves in the electromagnetic spectrum can be focused, not just light waves. I also know that energy can be contained/routed along magnetic flux lines.
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