[Electron]

The best place for grounding is to connect to the electric service ground wire. Or to the ground rod that is in the ground close to electric service at the house. Most houses have the coaxes located close to electric service because that is where ground is at. Use a coax ground block to connect the coax from the antenna to ground. Home depot has all manner of grounding hardware and ground wire. Use a ground strap to connect the ground wire to the antenna mount.