Check the NEC, article 810. A water line is an acceptable ground connection but you must do it according to NEC. Did I mention check the NEC?
prcguy
prcguy
So, while I have run a common ground line from my two antenna mounts on the chimney straight down to an 8 ft ground rod and have installed a gas discharge lightning module on each coax run, I have not bonded the ground rod to the water line.
Since the water line comes in over 25ft. away from the aforementioned ground rod, would it be acceptable to ground to the closest cold water line (inside the crawlspace adjacent to the ground rod outside) rather running a ground wire the 25+ ft. to where the line makes entry to the house?