Cell towers in Chatillon (Hauts-de-Seine)

1 water tower and 14 buildings carry the commune's antennas.

Declared locations include 41 rue Etienne Deforges, 29 Avenue de la Division Leclerc, 1-7 rue José Maria de Hérédia, 67 Rue Pierre Brossolette, 3 Avenue de la Republique and 44 avenue Marcelin Berthelot.

ANFR has approved 2 new sites that are not live yet, plus additions on 5 existing masts. New: Orange (4G and 5G, including 5G at 3.5 GHz) at 44 avenue de la République and Orange (4G and 5G, including 5G at 3.5 GHz) at 142 Rue des Roissys. 14 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

14 of the 15 masts are rooftop-mounted. The tallest support is 63 m at 1 allée Vauban (building). The median is 35 m, above the Hauts-de-Seine median of 28 m.

2018 was the busiest year, with 23 new systems, most of them 4G. Bouygues Telecom switched on the first 5G here in November 2020; Free Mobile followed in December 2020, SFR followed in April 2021. The oldest transmitter still listed here goes back to 1994.

Of the 15 masts in the commune, 2 masts carry all four networks, and Bouygues Telecom is the only carrier on 6 masts.

3.5 GHz 5G is declared by Bouygues Telecom on 6 of its 9 masts, Free Mobile on all 6 masts, Orange on all 4 masts and SFR on 3 of its 4 masts.

Nearby, Fontenay-aux-Roses (1 km to the south) has only 11 masts.

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

At 3 km² with 36,705 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.