All the elements are usually mounted on a metal beam or bracket along the antenna's central axis.

These piers support a single metal beam carrying a trough with more than 13,000 tonnes of water, 2.2 meters deep.

Some have developed into more permanent structures, supported by wood and metal beams and other add-ons.

Running for three weeks, this throbbing, clanging piece of collective art uses the pipes, metal beams and fabric of the building to generate sounds.

However, the entire metal grate deck and steel truss was replaced in 1995 with a slightly wider modern metal beam structure and an asphalt covered roadway.