My end fed antenna connects to a Wireman CQ 878 (spark plug lightning arrestor) at top of ground rod (and then goes through brick exterior wall to knife switch and manual antenna tuner). The ground rod is clamped to the pipe feeding my house breaker panel through about 25 feet of #6 solid copper. (Right below where the cable TV and telephone folks attached their clamp.)
The brass outdoor water faucet for that side of the house is about 2 feet through air to the top of the ground rod.
Should I connect the ground rod to the outdoor water faucet? If I did this, I would use brass clamps and solid copper wire.
By the way, this ground rod is also my RF ground for my tuner. The 84 foot long end fed wire loads on all bands from 80 to 10 meters.