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Originally Posted by Mike(Mont)
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.
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Maybe you figured it out. Cathode ray tubes routinely use charged metal aperatures to focus the electron beam, and can also use magnetic coils to focus as an alternative. I noted that Dunning has a background in television technology, which would mean he is familiar with these focusing methods used for electron beams.
According to the Vernell literature, the magnacast 5000 contains an AM transmitter as well as the "Scan gun" receiver. This "Scan Gun" has a cylindrical housing which could easily accommodate charged plates or coils that may be related to the "Forward Gauss" principle in some way.