Cell towers in Trignac (Loire-Atlantique)

Masts stand at rue de la Fontaine au Brun, La Petite Villle, Rue du Morta, La Cencie, La Gagnerie and 3 rue Claude Monet.

The declared supports are an 18 m pylon, at rue de la Fontaine au Brun, for Orange; a 30 m pylon, at La Petite Villle, for Free Mobile; a 26 m pylon, at Rue du Morta, for Free Mobile; a 33 m pylon, at La Cencie, for Bouygues Telecom and SFR; a 33 m pylon, at La Gagnerie, for Free Mobile; a 31 m building, at 3 rue Claude Monet, for Bouygues Telecom, Orange and SFR.

Over the past 12 months ANFR recorded 11 new systems here. ANFR has approved 2 new sites that are not live yet, plus additions on one existing mast. New: Bouygues Telecom (4G and 5G) at 3 Ter Cité Nouvelle, Free Mobile (4G and 5G, including 5G at 3.5 GHz) at 17 Rue des Aigrettes and SFR (4G and 5G) at 3 Ter Cité Nouvelle. 4 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

Systems from 2013 are still on the register. Free Mobile switched on the first 5G here in December 2020; Orange followed in July 2021, Bouygues Telecom followed in September 2025. 2025 was the busiest year, with 18 new systems, most of them 4G.

The tallest structure is a 33 m pylon at La Cencie. The median height of measured supports is 31 m.

3 supports carry only Free Mobile.

On 3.5 GHz, the fastest 5G band: Free Mobile on all 3 masts, Bouygues Telecom on all 2 masts, SFR on all 2 masts and Orange on 1 of its 2 masts. 5G is on 100% of masts here, against 86% across Loire-Atlantique towns with five or more masts.

Nearby, Montoir-de-Bretagne (3.3 km to the east) has 9 masts, more than here.

Most of the town's 6 masts are pylons (5).

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