I was just watching the opening of the Burj Khalifah tower in Dubai on the TV and wondered what range I would get if I could mount an aerial on the top floor!
From the top of the Burj Dubai tower (not the top office space) :)
Orange circle is the aircraft range at 10,000 feet, blue circle is at 40,000 feet.
(http://img3.imageshack.us/img3/4895/20100105075023.jpg) (http://img3.imageshack.us/img3/4895/20100105075023.jpg)