The final historic Radio New Zealand transmission mast has been removed from the Titahi Bay skyline.

The 220 metre structure above Owhiti St, north of Porirua, was demolished on Tuesday following months of preparation.

ROSS GIBLIN/FAIRFAX NZ A Titahi Bay radio mast that was te second tallest structure in New Zealand has come down.

Though the weather was not ideal, Martin Wilson, managing director of Abseil Access, the company that removed the mast, said the mast came down as planned.

"It was a big relief to have the job complete, with six months of planning coming down to one button," Wilson said.

"Nothing went wrong, that's the main thing. The mast fell slowly north, although it didn't quite land hit the target I marked for fun," he said.

DANIEL WHITFIELD The historic 220-metre Radio New Zealand transmission masts in Titahi Bay after it was demolished on February 16.

Assessing the site afterwards, Wilson said the top of the mast would have hit the ground at about 350kmh.

The tower, along with another 50m mast demolished late last year, transmitted five AM radio stations, including RNZ National and Newstalk ZB.

Built in 1937, it was New Zealand's tallest structure until Auckland's Sky Tower was opened in the mid-1990s.

It was opened by prime minister Michael Joseph Savage and allowed nationwide radio broadcasting for the first time.

A 10-year-old 137m mast would now transmit all the radio frequencies.

RNZ's Matthew Finn said it was definitely an end of an era but it was always going to happen.

"We had to establish future plans and this was one of them," he said.

Finn said the remaining mast also had an amount of rust and would have to be replaced in the future.

The area of Whitireia Park would remain partly closed as workers disassemble the fallen mast.

As the towers were quite an iconic landmark, he said there could be a chance another mast would be built on the same site as the 220-metre mast – just not quite as tall.

Last year, Justine Chalmers, a Dimock St resident, who had lived in the same house below the mast for 34 years, said she had mixed feelings about the demolitions.

"You get used to them being there," she said. "As kids we would get fluoro tubes and go up close to them and the tubes would light up in your hands. It was pretty cool."

Chalmers said she would miss them, but it was about time they came down.