Australia's tallest man-made structure, the Omega tower, has been demolished in a paddock in Gippsland.

The Omega radio navigation tower stood at around 430 metres tall but after a series of explosions it was brought crashing to Earth.

The defence facility was used for submarine navigation in the 1980s and '90s and was decommissioned in 2008.

The Department of Defence decided to demolish the tower after a young base jumper plunged to his death last year when his parachute failed to open.

Michael Pollock from the Department of Defence said the structure was no longer needed.

"From Defence's perspective, we've got to manage our liabilities appropriately and therefore it's time for the tower to go," he said.

The 300-hectare property will be decontaminated and advertised for sale.

Loading...

The demolition means a tower at the Harold Holt Naval Communication Station in Exmouth, Western Australia, is now the country's tallest structure.

Tower 0, which is a radio transmitter mast, is 387 metres tall.

The Q1 building on the Gold Coast remains Australia's tallest residential tower.