Saulnay

Arpheuilles (French pronunciation: [aʁfœj]) is a commune in the Indre department in central France.

Sainte-Gemme (French pronunciation: [sɛ̃t ʒɛm]) is a commune in the Indre department in central France.

Mézières-en-Brenne (French pronunciation: [mezjɛːʁ ɑ̃ bʁɛn] ) is a commune in the Indre department in central France.

Clion (French pronunciation: [klijɔ̃] ), also referred as Clion-sur-Indre, is a commune in the Indre department, central France. It was known in the Roman period as Claudiomagus.It is situated 38 km (24 mi) northwest of Châteauroux, the nearest large city. The Indre and Ozance rivers flow through the commune.

Villiers (French pronunciation: [vilje]) is a commune in the Indre department in central France.

Palluau-sur-Indre (French pronunciation: [palɥo syʁ ɛ̃dʁ], literally Palluau upon Indre) is a commune in the Indre department in central France.

Saint-Genou (French pronunciation: [sɛ̃ ʒənu] , [sɛ̃ ʒnu]) is a commune in the French department of Indre, Centre-Val de Loire, central France.

Le Tranger is a commune in the Indre department in central France.

Vendœuvres (French pronunciation: [vɑ̃dœvʁ]) is a commune in the Indre department, central France.

Murs is a commune in the Indre department in central France.

Paulnay is a commune in the Indre department in central France.

The HWU transmitter is a French facility for transmitting orders to submerged submarines of the French Navy. Situated near Rosnay at 46°42'47"N, 1°14'39"E, it is one of the largest radio transmitters in France and is visible on satellite pictures although it is completely blurred out. It uses an antenna carried by thirteen guyed masts (the tallest one 357 m, 6 of 310 m, 6 of 270 m), which are, together with the masts of the Allouis longwave transmitter, the tallest structures in France. The HWU transmitter works on 18.3 kHz, 20.9 kHz and 21.7 kHz. Its transmissions can be easily received in Europe when the transmitters are active by using a PC soundcard connected to a receiving coil and FFT software. Although the signals are very easy to receive, it may be impossible to decipher them without knowing the cipher and key used in the communications.