D.1 Development is not permitted by Class D if—
(a)in the case of the installation, alteration or replacement of system apparatus other than on a building or other structure—
(i)the ground or base area of the system apparatus would exceed 1.5 square metres; or
(ii)the system apparatus would exceed a height of 15 metres above ground level; or
(b)in the case of the installation, alteration or replacement of system apparatus on a building or other structure—
(i)the highest part of the apparatus when installed, altered, or replaced would exceed in height the highest part of the building or structure by more than 3 metres; or
(ii)the development would result in the presence on the building or structure of more than 2 microwave antennas.