The lightning ground should be a large, broad conductor attached to your roof tripod and routed directly to earth using a path that is shorter and lower impedance than your feedlines and rotor cables.
For example: Use copper flashing or very large conductor (#0 copper is pretty good) clamped to the tripod, and run directly to earthing via the shortest possible path, and that path should never be through the house. Let's say that path is 35 feet long. Great.
Now, make your feedlines and rotor cables substantially longer than that 35 feet, and run them inside to the station.
Obviously, there's lots to know about grounding for lightning protection. There was a multi-part article in QST last year on this very subject, and much information is available from the Polyphaser website.
Since you cannot directly ground a wire radiator, normal protection is employed in the antenna feedline and again should be outside the house, never inside.
If a huge slug of current is conducted to earth via the feedline, the feedline might simply fuse (melt) and open that circuit, but it will have done its job by then. You want that big current surge to all flow from your antenna to earth, leaving the balance of feedline going to your station equipment as a high impedance path which won't conduct any of the surge.
WB2WIK/6