Second mast creeping up on ‘big brother’
73m,” said an Arqiva spokesman.
He said the temporary tower was “still shy of its larger sibling.”
The second mast needs to be built while vital work is carried out on the broadcasting technology on the original landmark structure.
The temporary mast will be 317m (1,040ft) tall, just shy of the existing tower and is needed to transmit signals while changes are made to the top of the original mast.
It will be supported by dozens of steel cables.
The work would lower the height of the mast from its current 330.4m (1,084ft) to 319m, but it would still retain its place as the tallest free-standing structure in the UK.
The mast was built to replace a previous one brought down by high winds and ice in March 1969.