Shore Station LF & VLF Antennas - See VLF transmitting antenna design and NAVELEX 0101, LF & VLF Systems Handbook
Shore Station LF & VLF Antennas - See VLF transmitting antenna design and NAVELEX 0101, LF & VLF Systems Handbook |
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| Jim Creek VLF |
Yosami VLF |
Lualualei VLF |
Harold E Holt VLF
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| Balboa VLF
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Annapolis VLF
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Cutler VLF
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Nord LF antenna - NPG Stockton |
Shore Station HF Antennas - See NAVELEX 0101,104 HF Antenna Handbook |
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Typical Receiver Site Antenna Layout |
Rhombic
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3-Wire Rhombic
Nested Rhombic |
Quadrant
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| Conical Monopole Antenna - The conical monopole antenna is used in HF communications. It is a broadband, vertically polarized, compact omnidirectional antenna. This antenna is adaptable to ship-to-shore, broadcast, and ground-to-air communications. It is used both ashore and aboard ship. When operating at frequencies near the lower limit of the HF band, the conical radiates in much the same manner as a regular vertical antenna. At the higher frequencies, the lower cone section radiates, and the top section pushes the signal out at a low angle as a sky wave. This low angle of radiation causes the sky wave to return to the Earth at great distances from the antenna. Therefore, this antenna is well suited for long-distance communications in the HF band. | |||
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Conical Monopole
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Conical Monopole Hy-Gain 2012AA (3-30 mc)
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Conical Monopole Hy-Gain 2012AA details 
"Performance Evaluation of Conical Monopole" - Dec. 1992 NPS Thesis (download 2.6 MB pdf) |
Conical Monopole -Hy-Gain 2012AA - Kato Souli Greece
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| Inverted Cone Antenna - The inverted cone antenna is vertically polarized, omnidirectional, and very broadbanded. It is used for HF communications in ship-to-shore, broadcast, and ground-to-air applications. The radial ground plane that forms the ground system for inverted cones is typical of the requirement for vertically polarized, ground-mounted antennas. The radial wires are one-quarter-wavelength long at the lowest designed frequency. | |||
| Inverted Cone AS-2212/FRC (2-30 mc) AS-2213/FRC (2.5-30 mc) AS-2214/FRC (3-32 mc)
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Inverted Cone - Kato Souli Greece
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Inverted Cone (Kato Souli)
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Elevated Discone
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| Sleeve Antenna - The sleeve antenna is used primarily as a receiving antenna. It is a broadband, vertically polarized, omnidirectional antenna. Its primary uses are in broadcast, ship-to-shore, and ground-to-air communications. Although originally developed for shore stations, there is a modified version for shipboard use. Photos below show a sleeve antenna for shore stations. Sleeve antennas are especially helpful in reducing the total number of conventional narrowband antennas that otherwise would be required to meet the requirements of shore stations. With the use of multicouplers, one sleeve antenna can serve several receivers operating over a wide range of frequencies. This feature also makes the sleeve antenna ideal for small antenna sites. | |||
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Sleeve Antenna at NPG receiver site - this has two wire-spreaders in the
vertical section |
Sleeve Antenna at NPG receiver site |
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Fixed Log Periodics |
Vertical Fixed Log Periodics
Sector Vertical Log Periodic |
Horizontal Fixed Log Periodic (Kato Souli)  |
Antenna Lead Switching System
Switchyard - Barrigada Guam |
Rotatable Log Periodic |
Rotatable Log Periodic - Nea Makri Greece  |
Rotatable Log Periodic |
Rotatable Log Periodic - Nea Makri Greece 
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| AN/FRA-109 (similar to AN/FRA-107)
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4-30 mc, 600kw PEP transmitting antenna system -
steerable beam or omnidirectional
FRA-109 Monopole FRA-109 reflector |
Kato Souli Greece |
Kato Souli Greece
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| AN/FRD-10
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CDAA Receiving Antenna System
Mainly used for NAVSECGRU DF/Intercept - but several were also used for COMMSTA general service communications |
AN/FRD-10 CDAA page |
CDAA Components
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AN/TRA-40 CDAA |
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