In my experience with this sim, the image of the mast is often times very inconsistent. It will apprear to be a certain height and then the next second its only about 2/3 as tall, which I always assumed was due to the inabilitly of the computer to clearly display the image. With a more substantial object such as a smokestack, this image on the screen remains stable, and it would seem to me that you would get a more reliable result for that reason. I havent tested this idea, but it makes sense, at least in theory. Joe S
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