I would get a ground rod, just drive it into the ground right next to the fencer and you hook a wire from the ground rod to the ground side on the fencer, then a wire goes on the hot side to your fence. I think the amount of shock is based on the joules that the fencer puts out. I do know with goats it does need to be pretty strong to make them respect it, but if you are using the tape fencing they should respect that pretty good since it will look like regular fencing.