You are correct. They have extended the antenna on top several times to outreach the Malaysian towers. How many more feet above sea level is Kuala Lumpur than Chicago?
No. Antennas are not counted in the height of a building, only the superstructure to which the antennas are mounted. The Sears Tower as originally built exceeded the Petronas Towers on superstructure. Also the height is not above sea level but above ground level.
Acccording to the
Council on Tall Buildings and Urban Habitatat publicized in July 1997 the new rules to judge the height of a high-rise building.
Buildings' features were divided into four categories by
Cat. 1: height to structural or architectural top
Cat. 2: height to highest occupied floor
Cat. 3: height to top of roof
Cat. 4: height to tip of spire or antenna
The Sears Towers superstructure at the outset was higher than the Petronas Towers. The Sears Tower is the tallest building in categories 2 and 3. After 1 World Trade Center came down, the Sears Tower regained the record in Category 4.