This is just curiosity but if a chimney ran vertical up the side of a house right beside a tv tower does this count as structure? A friend was talking about a possible future install and it got me to thinking. The tower isn't even used for tv signal anymore. Much like most rural folk in Canada we are relegated to satellite internet service, I'm guessing the tower would only be 6 to 8ft from the possible exit point of the chimney out of the basement and would probably be roughly 6 to 8ft higher then the chimney cap. Come to think of it this could be in my future as well!