Cell towers in Triel-sur-Seine (Yvelines)

Most of the town's 10 masts are pylons (5); 2 water towers and 1 camouflaged "tree" pylon make up the rest of the mix.

Antennas are listed at Chem des Picardes, Rue de Chanteloup, Les Petits Haumonts, Les Bouveries, 31b rue Paul Doumer and Cheverchemont.

ANFR has approved one new site that is not live yet, plus additions on 2 existing masts. New: Bouygues Telecom (4G and 5G) at 4 RTE de Verneuil. 6 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

ANFR lists a 43 m pylon at 3 Chemin de l'Ecole as the tallest structure. The median height of measured supports is 27 m.

3 masts belong to the commune itself and 2 to On Tower France; the rest sit mainly on private buildings.

Systems from 1994 are still on the register. Free Mobile switched on the first 5G here in December 2020; Bouygues Telecom followed in December 2021, SFR followed in April 2022. 2017 was the busiest year, with 17 new systems, most of them 4G.

3 supports carry only Free Mobile.

On 3.5 GHz, the fastest 5G band: Free Mobile on 4 of its 5 masts, SFR on all 3 masts, Bouygues Telecom on 2 of its 4 masts and Orange on 1 of its 2 masts.

Chanteloup-les-Vignes lies 1.9 km to the east and has only 6 masts.

12,206 residents over 14 km²: supports are mostly pylons, not rooftops. It is part of the CU Grand Paris Seine et Oise intercommunal grouping.

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