Which of the following is good practice when installing ground wires on a tower for lightning protection?
Why Lightning is a very fast, high-current impulse with lots of high-frequency energy, so what matters is the inductance of the ground path, not just its DC resistance. Short, direct conductors with gentle sweeping bends keep that inductance low so the surge goes to earth instead of flashing over to your equipment. Long runs, coils, or loops in a ground wire act like an inductor and raise the voltage the surge develops.
Watch out Right-angle bends are exactly what you must avoid; a sharp bend adds inductance and can let the surge arc across the corner, so a minimum bend radius of about eight inches is recommended. Drip loops belong on feedlines entering a building to shed rainwater, not on lightning ground conductors.
Lightning hates corners: short, direct, gentle curves. Sharp bends mean inductance and flashover.