In my experience, there does not seem to be an inherent attraction between lightening and 'tall' objects, even tall metal objects. I live in central Florida, one of the lightning capitals of the world, on 32 acres with forest, cleared land and lake. My property is frequently struck, almost daily during summer. Yet it strikes the flat ground as often as anything else. In fact, there is a sort of 'hot spot' about 100' X 100' between the house and barn that has been struck no less than 5 times this year! I've got eyewitnesses and the burned grass to prove it!(it burns the grass in the most peculiar way!)The ground in this spot is flat and grass covered. Why strike there and not the grounded 40' power pole a couple of hundered feet away, which has not been struck once this year?! Maybe an object has to be REALLY tall, like a few hundred feet or more, before it makes any real difference. This probably jibes better with the physics, anyway. I mean, if the charge has just traveled through several thousand feet of air, of what real importance is another 30 feet one way or the other?

Jimbo