A lightning protection system does not prevent lightning from striking; it provides a means for controlling it and preventing damage by providing a low resistance path for the discharge of lightning energy. But lightning protection systems have a confusing history. The earliest lightning rod design, by Ben Franklin, ended in a sharp pointed trident which may have actually created an electrical field around the tip which invited strikes. You'll notice that modern lightning rods have a short blunt tip and that they are connected to earth by heavy metal cables, often using braided copper. Having a properly-designed lightning protection system is very important if you're going to have one at all, since an improperly designed or installed system might actually increase the chances of a building being damaged by a lightning hit. Lightning strikes at buildings and other sudden electrical currents (such as a tree touching a high tension power line) produce very high voltages which can take surprising routes at a property such as following underground tree roots, metal porch railings, and copper or steel building water pipes.
Curtis-McKinley Roofing and Sheet Metal uses the highest quality in lightning arrestor systems, properly designed to minimize the potential for lighting strikes as well as the damage that might occur from them.