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If your monitor displays wavy lines, rolling bars, "hum" or "crosstalk" over an otherwise good picture, chances are you are experiencing a ground loop. This problem could be due to EMI noise induced from nearby cabling, or it could be due to differences in ground potentials between the cameras and monitors or other equipment. Eliminate these problems quickly and inexpensively by inserting our ground loop isolator (for CCTV) or Humbucking Choke (for broadcast applications) anywhere along the coax.