At an East Lindsey District Council planning meeting, district councillors voted nine to six to approve an application by O2 (UK) Ltd to put a 30 metre high mast with six antennae on a site off Warren Road.
The decision came despite opposition both from the parish council and from governors and the headteacher at the 250 pupil Church of England primary school.
Speaking against the application ward representative Coun Robert Palmer expressed fears emissions from the mast could pose long-term health hazards to children.
He recalled the risks may not yet be quantified - just as they had not been 40 years ago when, during his Army career, he was given 200 cigarettes a week.
He said: "At the time, it was thought cigarettes were good for you."
However Coun Bud Shields insisted there was no scientific evidence of any health risk. "It's all just scaremongering," he said.
Coun Jenny Crooks suspected those who objected to the mast all themselves used mobile phones.
Coun Edward Mossop suggested it might be possible to find another location for the mast - possibly at Donna Nook.
Following the debate, chairman of the primary school governors David Paul expressed dismay at the decision.
He said: "It's very disappointing."
O2, who were represented at the meeting by Bhavesh Mistry, maintain a new mobile radio base station is required to improve the service for mobile phone users in the area.
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