So the 50V reading is between the ground rod and the center wire of the coax? I can't figure why the Comcast guy would measure that way. If he was looking for grounding problems I'd expect him to measure to the coax shield/braid.
If the building grounding and bonding has all been checked out and is fine, it sounds as though ot might be a problem on the cable network. Perhaps they're feeding DC power along the cable to power repeaters and a blocking capacitor has gone leaky?
P.S. Didn't think to ask before whether the measured voltage was AC or DC.
[This message has been edited by pauluk (edited 02-21-2006).]
