Residents march against the mast in Llanidloes last month

Llanidloes Tetra Mast Action Group will put its concerns about health issues from Tetra to MMO2 Airwave.

The group will also complain that residents were not consulted before the 15-metre mast was erected near the town centre.

But the firm and the National Radiological Protection say there is no evidence of any risk to people.

Action group chairman and Llanidloes mayor Edward Breeze said he expected the meeting, at the town's community centre on 26 July, to be heated.

Tetra, a new hi-tech police secure communications system, is being rolled out across England and Wales with 3,200 masts, 300 of them in Wales.

"We've printed 600 flyers which we intend to put through the letter boxes of homes in the town," said Mr Breeze.

"People in the town are concerned about the mast, but more about the health implications.

"We've been told that David Robinson and Peter Sitch will come to the meeting from MMO2 Airwave and a Dr Michael Clark will also be there from the National Radiological Protection Board.

"We have our own expert from Exeter, Dr Graham Blackwell."

More than 70 placard-waving campaigners marched through Llanidloes last month in protest at the mast, on land owned by Quality Tools and Engineering on the Maes y Llan industrial estate.

'Huge benefits'

The group has been campaigning for months against the development.

The company behind Tetra says campaigners' claims are 'nonsense'

But Mr Sitch said: "What the action group is saying is nonsense.

"We've written to Llanidloes Town Council on many occasions and received very few replies."

He said the Tetra mast in Llanidloes was producing frequencies below the national guidelines.

"Not only that," said Mr Sitch. "The mast will provide huge benefits to people in the town.

"I understand the A470, which passes by Llanidloes, has more accidents per mile than any other road in the UK.

"That's one of the reasons why the emergency services need good radio coverage so they can rush to accident scenes."