I like the chimneys, cooling towers masts, powerlines and pylons and have downloaded several files from flightsin to to add these along with a couple of files that add smoke, etc. To me as a low and slow type of flyer they add much more realism albeit at the expense of a couple of FPS. You really need to be careful of powerlines when you land or take off from quite a few small airfields, especially in a low powered aircraft or ultralight.
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