Cell towers in Sarzeau (Morbihan)

Most of the town's 12 masts are pylons (11); 1 water tower make up the rest of the mix.

Masts stand at Le Pâtis Haut, Le Haut Bohat, Capitainerie du Port de St Jacques, St Colombier, Coet D'Amour and Coët Huel.

ANFR lists a 48 m pylon at Le Haut Bohat as the tallest structure. The median height of measured supports is 35 m.

Systems from 1998 are still on the register. SFR switched on the first 5G here in November 2021; Free Mobile followed in December 2021, Bouygues Telecom followed in December 2021. 2021 was the busiest year, with 49 new systems, most of them 4G.

Over the past 12 months ANFR recorded 8 new systems here. Approved additions not yet in service are pending on 3 existing masts, for example Bouygues Telecom (5G 3.5 GHz) at La Maison Neuve, Bouygues Telecom (5G 3.5 GHz) at Coet D'Amour and Orange (4G and 5G, including 5G at 3.5 GHz) at La Maison Neuve. 12 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

2 masts carry all four networks.

5 masts belong to Hivory and 3 to Totem.

On 3.5 GHz, the fastest 5G band: Orange on 4 of its 5 masts, Bouygues Telecom on 3 of its 9 masts, Free Mobile on 3 of its 4 masts and SFR on 3 of its 9 masts. 5G is on 100% of masts here, against 87% across Morbihan towns with five or more masts.

Nearby, Arzon (9.8 km to the west) has only 8 masts.

The widest declared gap between neighbouring supports is about 3.1 km, to the south-west of the centre.

Among the 35 Morbihan towns with at least five masts, Sarzeau ranks 6th by mast count. With 12 masts for 9,212 residents, or 13 per 10,000, it has more masts per inhabitant than the median for those towns (10).

9,212 residents over 60 km²: supports are mostly pylons, not rooftops. It is part of the CA Golfe du Morbihan - Vannes Agglomération intercommunal grouping.

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