Parents of children at a Cornish school are fighting to halt construction of a planned mobile phone mast.
The phone firm said any mast would use low power transmitters
An application has been made by communications company O2 for a site near King Charles School at Falmouth.
More than 450 parents and residents have signed a protest petition. Plans for a mast at another location nearby were turned down four years ago.
O2 said only low power radio transmitters would be involved if the new mast was granted permission.
The proposed site for the 45ft (13.7m) tall o2 phone mast is across the road from the school, about 50 yards (46m) from the playground.
Four years ago, the same company, then BT Cellnet, was refused permission for a mast at a sports club close by.
Parents of students at the school said the latest attempt prompted resentment.
Miriam Venner said: "I think there's huge resentment because we worked really hard last time to let them know how we felt as parents. We put a huge amount of effort into a campaign - and democracy won."
The phone company said the mast would involve low power radio transmitters, hundreds of times lower than a mobile phone and less than a tenth of the power of a taxi's two-way radio.
It said: "We have to provide coverage and capacity for all mobile phone users and, by Christmas, 60 million handsets will be in use.
"These protests come from a small minority of people. If people do have concerns and issues, we are more than happy to come and meet with them."