Use horizontal ground electrodes when there is some soil on rock surface. Spread the electrodes around the mast.
- Route the electrodes from the grounding connector at the mast base to the most desirable direction away from the mast.
- Use two or three electrodes. Using more electrodes lowers the impedance.
- Spread the ground electrodes on the rock surface and bury in patches of soil or fix with clamps to the rock.
- Cover a wide area of the surface to make a low-impedance capacitive ground electrode.