Lightning rods are stainless steel rods mounted on the highest point in your working area, then a copper ground wire is run from that down to the ground and buried for about 6 feet long, below the frost line (here that means at bedrock or 4 feet if possible).
The tricky part is that if you have a metal roof, you have to ensure that the rod and the ground cable do not touch the metal. Mostly, we would mount the rod on a wooden extension that was available for the hay track, then run the cable down the side of the barn.
Lightning rods provide the easiest +/- open line for the lightning to travel. Lightning is like water -- it will always travel the easiest route.