Cell towers in Saint-Gratien (Val-d'Oise)

Declared locations include La Vache Noire, 49 rue de Sannois, 56 boulevard de la Gare, 53 Rue Jean-Jacques Rousseau, 5 Rue Hector Berlioz and 51 Rue D Argenteuil.

9 of the 10 masts are rooftop-mounted. The tallest support is 41 m at La Vache Noire (building). The median is 34 m, above the Val-d'Oise median of 25 m.

2021 was the busiest year, with 16 new systems, most of them 5G. Bouygues Telecom switched on the first 5G here in November 2020; SFR followed in December 2020, Free Mobile followed in May 2021. The oldest transmitter still listed here goes back to 1996.

Approved additions not yet in service are pending on 3 existing masts, for example Bouygues Telecom (5G 3.5 GHz) at 53 Rue Jean-Jacques Rousseau, SFR (5G 2100 MHz) at 56 boulevard de la Gare and SFR (4G and 5G, including 5G at 3.5 GHz) at 2 Rue Moque Souris. 9 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

3.5 GHz 5G is declared by Free Mobile on all 5 masts, Bouygues Telecom on 4 of its 5 masts, Orange on all 2 masts and SFR on 2 of its 3 masts.

Soisy-sous-Montmorency lies 1.9 km to the north-east and has 11 masts declared.

Of the 10 masts in the commune, 5 of the 10 masts host at least two operators.

Most declared azimuths point outward, along a corridor or valley rather than at the centre.

At 3 km² with 21,336 residents, the commune is dense enough that most antennas sit on rooftops rather than pylons. It is part of the CA Plaine Vallée intercommunal grouping.

Supports split between 9 buildings and 1 pylon.

Source: operator declarations to ANFR, as of October 2026. Projects that are only approved are left out of the totals.