English: Antenna feed bus towers of the VLF transmitter at the US Navy's Jim Creek Naval Radio Station, in Oso, Washington State. This station transmits orders to submerged US Navy submarines in the Pacific fleet at a frequency of 24.8 kHz with an output power of 1.2 megawatts, one of the most powerful radio transmitters in the world. This is one of two feed buses extending along the valley floor from the transmitter building, feeding power to an enormous overhead antenna consisting of 10 cables stretching 1.5 miles from one side of the valley to the other. From each 145 ft. tower a vertical feedline (faintly visible, top of picture) extends up 900 ft. to attach to the midpoint of each horizontal valleyspan cable. An anchor line attached to each feedline through a strain insulator goes down to a concrete anchor on the valley floor to prevent swaying. The voltage on the antenna is extremely high, around 200 kilovolts, requiring long insulator strings and corona rings where the feedline is suspended from the tower.

Alterations to image: Sharpened and increased contrast using Gimp image editor to bring out the antenna wires against the sky. As a result the mountainside and foliage looks considerably different from original image.