New Freedom Tower design unveiled

The tower will be surrounded by groups of steps leading to the entrance, serving as a public plaza and security buffer zone. A series of thigh-high rectangular slabs on the site's perimeter -- resembling tombstones in an artist's rendering -- will guard against truck bombs.

The antenna, to be used by radio and television broadcasters, has been given a more sculptural feel by Kenneth Snelson, a sculptor best-known for his Needle Tower, installed in New York's Bryant Park in 1968.

The antenna raises the building from 1,338 feet -- the height of the original World Trade Center's 110-story twin towers -- to the full 1,776 feet.

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