Eldartford has it right from a physics point of view.
Practically speaking, we also used to use metal window screen material (stands up better & you can see through it). Then just run a wire to ground (if you use a water pipe, have to make sure that there is no plastic splice to break ground...for experimental purposes, we used to bury a piece of foil/screen about 1 foot deep & soak the ground with water).
good luck,
Practically speaking, we also used to use metal window screen material (stands up better & you can see through it). Then just run a wire to ground (if you use a water pipe, have to make sure that there is no plastic splice to break ground...for experimental purposes, we used to bury a piece of foil/screen about 1 foot deep & soak the ground with water).
good luck,