A communications company has been ordered to take down one of its masts, following health concerns.
Nearby residents raised concerns about "health risks"
O2 has been served with a "stop" notice by North Norfolk District Council. It gives the firm three days to switch off a mast on North Walsham police station.
It will then have a month to remove the Tetra mast, intended for emergency service use.
The notice was issued after O2, which says the mast is safe, appealed against the council's refusal to grant retrospective planning permission.
The mast was turned on in Yarmouth Road without planning permission in February and was followed by a number of health complaints by people living in the area.
O2 applied for planning permission, but this was refused.
The council then issued an enforcement notice against O2 and the firm appealed.
The appeal process could take up to six months and the equipment would have remained in place.
The council said the latest action was to bring the matter to a head.
O2 said it would comply with any legal requirement.