Tavolara is a small island off the northeast coast of Sardinia, Italy. The island is a limestone massif 5 kilometres long and 1 kilometre wide, with steep cliffs except at its ends. Its highest point, Monte Cannone, is 565 metres above sea level. A cove and beach can be found at each end of the island, Spalmatore di Fuori at the northeast, and Spalmatore di Terra at the southwest. Currently, the island is inhabited by only a handful of families, and has a small cemetery and summer restaurant. The water around the island is a popular spot for scuba diving.

Very low frequency or VLF is the ITU designation for radio frequencies (RF) in the range of 3–30 kHz, corresponding to wavelengths from 100 to 10 km, respectively. The band is also known as the myriameter band or myriameter wave as the wavelengths range from one to ten myriameters. Due to its limited bandwidth, audio (voice) transmission is highly impractical in this band, and therefore only low data rate coded signals are used. The VLF band is used for a few radio navigation services, government time radio stations and for secure military communication. Since VLF waves can penetrate at least 40 meters (131 ft) into saltwater, they are used for military communication with submarines.