Loop Antenna Info Request

I picked up a loop antenna made by Electro-Metrics (Model ALR-30M). Does anyone have any info on this ? I need to know what to do with the BNC jack marked ..."Injection In"... . I expect it requires some signal input, CW or Swept or ??

Thanks,

73, Dick, W1KSZ
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Richard W. Solomon, W1KSZ
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JeffM

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