<http://forums.radioreference.com/threads/vent-pipe-grounding.45135/>
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"Since the vent pipe is cast iron, does the mast need to be grounded via a ground wire?  The vent pipe attaches to the cast sewer pipes.\n\nI assume I will still need a grounding block for the coax.  Radio Shack sell a \"2.4GHz Single Grounding Block\"  Anyone know what the 2.4 GHz is refering to?  Is there any noticeable signal loss with using one?\n\n\nThanks."
<https://forums.radioreference.com/threads/vent-pipe-grounding.45135/>