Key legal question
Whether a pager/radio-call antenna on the same site must be included in the aggregate installation-emission calculation for a mobile phone base station under the NISV.
Extracted holding
No. Pager systems are technically and operationally distinct from cellular mobile telephony and are not part of the same 'installation' for the purpose of installation limit values.
Extracted reasoning
The court distinguished mobile telephony from passive one-way paging systems. Although pager antennas in the vicinity must be considered for immissions under Art. 8 USG, they are not to be aggregated with the mobile base station as one installation under Art. 3(6) NISV and Annex 1, since only wireless mobile telephony facilities fall within that installation category.