Noviken VLF Transmitter is a facility used by NATO for transmitting messages to submerged submarines on 16.4 kHz under the callsign JXN. It is situated near Gildeskål, Norway and uses as antenna three wires spun between two mountains. The longest of these spans is 2,375 metres long.
The transmitter building is situated at 66° 58′ 58″ N, 13° 52′ 23″ E.
References
Noviken VLF Transmitter Wikipedia(Text) CC BY-SA