Better still for RF ground than any water pipe would be a quarter wave counterpoise either inside or preferred outside the shack, or as much as you can run near the earth outside. End fed wires bring RF into the shack worse than any other antenna. I gave up on them long ago for balanced, (doublet or dipole) antennas. OF course, I have lived in all bad RF earth areas! Solid rock 18 inches down here! 73, Stuart K5KVH