Open main menu


Original file(2,560 × 1,920 pixels, file size: 2.64 MB, MIME type: image/jpeg)

Structured data


Add a one-line explanation of what this file represents


English: US Navy Cutler VLF Transmitter facility, Maine, as seen from across the Little Machias Bay of a distance of about 2 miles. It transmits operational orders one-way to submerged submarines worldwide at a frequency of 24 kHz with a power of 1.8 megawatts, and was at one time the most powerful radio station in the world. This type of antenna is called a trideco or umbrella antenna, a form of capacitively top-loaded monopole antenna. It consists of an array of 13 vertical steel masts attached at the top to a system of horizontal cables like an 'umbrella". The cables are divided into 6 "panels" which radiate out from the central tower in a pattern resembling a snowflake. The central mast is 979 ft (298 meters) tall, and the entire array is 6140 ft (1.871 km or 1.16 miles) in diameter. The central mast actually radiates the VLF radio waves, while the top cables form a large capacitor with the ground, which serves to increase the efficiency of the antenna. Under each mast there is also a system of cables suspended a few feet above the ground radiating from the mast base, called a counterpoise (not shown) which functions as the other plate of the capacitor.
Source Own work
Author Noelle Keyser
(Reusing this file)

Released into the public domain (by the author).


Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
In some countries this may not be legally possible; if so:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

File history

Click on a date/time to view the file as it appeared at that time.

current10:29, 30 January 2012Thumbnail for version as of 10:29, 30 January 20122,560 × 1,920 (2.64 MB)AndreasPraefcke (talk | contribs)Reverted to version as of 02:21, 29 March 2008
15:22, 27 June 2011Thumbnail for version as of 15:22, 27 June 20112,560 × 1,920 (1.46 MB)Jakuzem (talk | contribs)Reduced file size by selecting higher compression level.
02:21, 29 March 2008Thumbnail for version as of 02:21, 29 March 20082,560 × 1,920 (2.64 MB)Atlantea (talk | contribs){{Information |Description=The Cutler VLF Transmitter as seen from across the Little Machias Bay of a distance of about 2 miles. |Source=self-made |Date=2007-03-15 |Author= Noelle Keyser |Permission=Released into the public domain (by th
  • You cannot overwrite this file.

The following page uses this file:

File usage on other wikis

The following other wikis use this file: