Cell towers in Fontenay-le-Fleury (Yvelines)

Declared supports include 1 silo and 1 camouflaged "tree" pylon, with pylons making up most of the remainder.

Antennas are listed at avenue Georges Pompidou, 1 Avenue Albert Schweitzer, 6 Chem de la Ratelle and 43 Rue Rene Dorme.

The declared supports are a 39 m pylon, at avenue Georges Pompidou, for Bouygues Telecom and Free Mobile; a 42 m pylon, at 1 Avenue Albert Schweitzer, for Bouygues Telecom, Free Mobile and Orange; a 12 m building, for Bouygues Telecom; a 16 m silo, at 6 Chem de la Ratelle, for Bouygues Telecom and SFR; a 15 m camouflaged "tree" pylon, at 43 Rue Rene Dorme, for Orange.

The highest support stands 42 m at 1 Avenue Albert Schweitzer (pylon). The median is 16 m, slightly below the Yvelines median of 25 m.

Systems from 2004 are still on the register. Bouygues Telecom switched on the first 5G here in November 2020; Free Mobile followed in August 2021, SFR followed in March 2022. 2019 was the busiest year, with 7 new systems, most of them 4G.

Approved additions not yet in service are pending on 2 existing masts, for example Bouygues Telecom (4G 1800 MHz) and Bouygues Telecom (4G and 5G, including 5G at 3.5 GHz) at 1 Avenue Albert Schweitzer. 4 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

On 3.5 GHz, the fastest 5G band: Bouygues Telecom on 2 of its 4 masts, Free Mobile on 1 of its 2 masts, Orange on 1 of its 2 masts and SFR on its only mast.

Saint-Cyr-l'Ecole lies 2.1 km to the south-east and has 13 masts, more than here.

Colocation covers 3 supports.

Among the 62 Yvelines towns with at least five masts, Fontenay-le-Fleury ranks 57th by mast count. With 5 masts for 13,680 residents, or 4 per 10,000, it has fewer masts per inhabitant than the median for those towns (7).

Figures above cover installations declared to ANFR as in service or technically operational, as of October 2026; approved projects are not counted.