Model SB-104
UHF Shipboard Antenna Omni 350-500 MHz

Frequency Range: 350-500 MHz
Gain: 2 dBi
VSWR: 2.5:1 Max
Polarization: Vertical
Pattern: Omnidirectional
Size: 47″ H

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These UHF shipboard antennas are designed for transmit and receive applications. They provide vertically polarized, omni-directional coverage within the specified frequency range. The antennas are enclosed in fiberglass housing, making them suitable for use in extreme marine shipboard environments. The dipole antenna design allows for mounting the antennas in proximity to ship structures without significantly degrading antenna performance.

These antennas are cylindrically dipole radiator fed by a conventional coaxial RF line. Integrated into the antenna structure is a balancing transformer arrangement, which allows the dipole radiator to be fed in a balanced manner eliminating extraneous line currents.

Radiation patterns for the antenna correspond to those of a balanced dipole in free space. Coverage in the plane perpendicular to the radiating elements is omnidirectional. Figure 8 coverage, with nulls off the ends of the elements, is provided in the plane of the radiators. The inherent broadband impedance characteristics make the antenna relatively insensitive to its mounting environment and minimize azimuth and zenith pattern distortion at any location.

The standard color supplied is haze gray however the antennas can be provided in other colors, as requested. The radome is painted with three coat paint system. All external metal parts are either powder coated or 316 stainless steel for maximum corrosion resistance.

Spec Sheet

Humidity 0-100%
Mounting 1/4” bolts on a 3.88 inch bolt circle
Wind 100 Knots
Power Capability 100 Watts
Forward Gain 2 dBi
VSWR 2.5:1 Max
Housing Diameter 3 Inches
Frequency Range 350-500 MHz
Base Diameter 4.5 Inches
Ice 4.5 psf on all exposed surfaces
Height 47 Inches
Temperature Operation -54º C to +65º
Temperature Non-Operating -62º C to +71º C
Weight 7.5 lbs
Construction Fiberglass housing, aluminum mounting flange
Shock MIL-S-901C, Grade A, Class I
Vibration MIL-STD-167-1, Type I
Azimuth Beamwidth Omnidirectional
Dust Test per MIL-STD-810 Method 510.2
Application Transmitting or Receiving
Polarization Vertical
Salt Fog Withstands 100 hrs test