HF Broadband Antenna 2.7-30 MHz 2 dBi Omni

Frequency Range: 2.7-30 MHz
Gain: 2 dBi
VSWR: 2:1 max
Polarization: Vertical
Pattern: Omnidirectional
Size: 66.5′ H, 340′ D

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The VOBA-IIA antenna is suitable for skywave propagation from medium to long range circuits. This antenna design can be used for short range groundwave circuits up to approximately 100 miles, and is well suited for naval shore-to-ship communication.


The antenna is ruggedly designed and will withstand harsh environments such as high wind, ice, and snow. The broadband frequency capability does not require tuning.


The antenna is designed in accordance with the U.S. Navy specifications MIL-A-28768B (EC) and MIL-A-28768/1B (EC). The antenna is a fixed station antenna which covers various frequency bands without requiring any frequency tunings or frequency adjustments.

Equipment Supplied:

Prefabricated alumoweld curtain, galvanized steel tower with built-in ladder, safety climbing equipment, guys, base insulator, embedment hardware, ground screen, antenna matching unit, and spare hardware.

Optional Equipment:

Repair kit, repair tool kit, and erection kit. Coaxial cable, connector adapters and mating adapters.

Spec Sheet


Power, kW 25 kW avg/50 kW PEP, 100 kW Peak Instantaneous
Azimuth Pattern Omnidirectional +/- dB
Input Connector 3-1/8″ EIA Flange
Wind Loading 125 MPH Wind, no ice 90 MPH Wind, 1/2 Inch radial ice
Gain 2 dBi Between 0 and 15 Degrees above the Horizon
Frequency Range 2.7-30 MHz
VSWR 2:1 Maximum
Diameter 340 Feet
Shipping Volume 438
Shipping Weight 5,468
input Impedance 50 Ohms Unbalanced
Height 66.5 Feet
Ground Screen Radius 90 Feet
Polarization Vertical