Cell towers in Fontenay-sous-Bois

2 supports are declared underground, in a gallery or a tunnel. For questions about exposure, see the exposure guide.

Most of the town's 29 masts are buildings (24); 2 underground or tunnel sites and 1 bridge or viaduct make up the rest of the mix.

Place names on the register include 11 Avenue du Val de Fontenay, Val de Fontenay, Rer Val de Fontenay, Gare Rer A Val de Fontenay, 2 rue Gabriel Lacassagne and 52-54 avenue du Mal de Lattre de Tassigny.

2016 was the busiest year, with 45 new systems, most of them 4G. Local 5G started with Bouygues Telecom in November 2020; Free Mobile followed in December 2020, SFR followed in March 2021. The oldest transmitter still listed here goes back to 1996.

14 systems were switched on in the past 12 months. Approved additions not yet in service are pending on 4 existing masts, for example Bouygues Telecom (5G 3.5 GHz) at 2 rue Clos D'Orléans, Free Mobile (5G 3.5 GHz) at 15 Rue de la Croix Heurtebise and Free Mobile (5G 700 MHz) at 66 Rue la Fontaine. 17 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

24 of the 29 masts are rooftop-mounted. The tallest support is 59 m at 1 rue Martin Luther King (building). The median height of measured supports is 23 m.

3.5 GHz 5G is declared by Bouygues Telecom on 8 of its 12 masts, Free Mobile on 7 of its 9 masts, Orange on 7 of its 10 masts and SFR on 7 of its 9 masts.

1.4 km to the east, neighbouring Le Perreux-sur-Marne has 24 masts declared.

Of the 29 masts in the commune, only one mast carries all four networks.

By mast count, Fontenay-sous-Bois is 11th of the 44 Val-de-Marne towns that have five or more. With 29 masts for 53,757 residents, or 5 per 10,000, it has fewer masts per inhabitant than the median for those towns (7).

At 6 km² with 53,757 residents, the commune is dense enough that most antennas sit on rooftops rather than pylons. It is part of the Métropole du Grand Paris intercommunal grouping.

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