In article , Richard Clark
wrote:

On Wed, 08 Mar 2006 19:14:02 GMT, "NA"
wrote:

Can anyone tell me about "fan antennas" like those used on the large navy
ships.

Hi Jim,

It is an array of co-planar, parallel monopoles driven at the same,
common point. The size of each in the array is different spanning
from short to long such that at least one is resonant within a wide
band of frequencies.

snip

Hello, and the only fan antenna that I have any experience with is the
venerable 2-6 MHz twin fan transmitting antenna used on USN combat ships.
This antenna consists of two sets (port, starbaord) of three sloping wires
strung from a yardarm on the stack to the feedpoint on the deck. A VSWR
of 3 or less is typically achieved using a fixed passive LC network. By
design, most of the radiation actually comes from RF currents induced on
the stack by the fan wires. Sincerely,

John Wood (Code 5550) e-mail:
Naval Research Laboratory
4555 Overlook Avenue, SW
Washington, DC 20375-5337