Here the shield connects to a four-foot ground stake sunk into the salty mush. The center conductor connects to my random wire antenna. The cable runs under the lawn, behind a gutter drain pipe up to the roof where it enters the attic through a soffit ventilation hole and then runs across the attic floor dropping down inside a closet to my radio room. Here it connects into the antenna multicoupler which drives three receivers. The multicoupler is grounded to the house power ground through the three prong power cable.
All receivers are also grounded to the multicoupler and the house power ground.
Here is the problem. Interference currents from noisy appliances can find their way to ground via two paths. One path is via the power ground system. The other path is via the outer shield of the coaxial feedline. At the far end of the feedline these currents can reflect back and enter my feedline.