Model HT-25A
HF Broadband Transportable Dual Input Antenna H/V 2-30 MHz

Frequency Range: 2-30 MHz
Polarization: Horizontal and Vertical
Pattern: Omnidirectional
Deployed Size: 260′ Diameter
Model Number: HT-25A
Military Nomenclature: AS-4161/TYQ-23V

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The HT-25A is a predominantly horizontally polarized, dual input antenna with a full 2 to 30 Mhz instantaneous bandwidth at each input. The antenna is formed using crossed fan-type sloping dipoles. A sectionalized mast is used to elevate the center to 21 feet. The mast also supports the unit that houses the hybrid and impedance matching devices. The antenna elements are made of vinyl coated galvanized cable to protect the elements from corrosive environments and to minimize high voltage hazards.


The HT-25A is a militarized, transportable HF antenna designed specifically for short range (0-300 miles) near vertical incident skywave circuits. The horizontal polarization permits operation over all soil types without the need for a ground screen. A hybrid feed provides two isolated broadband RF inputs suitable for receive and/or transmit applications up to 1 kW average power. Additionally, the two crossed dipoles provide polarization diversity for receiving. This lightweight antenna is rugged and easy to erect. The antenna may be erected by two men in less than one hour. The elements are stored on winder boards that contain the terminations, the permanently attached guys, grounding wires and interconnects.

Equipment Supplied:

The antenna comes equipped with radiating elements containing terminations, a dual input hybrid, a sectional mast, guys, a pivot base, anchors, ground rods, hammer, two transit cases, and two coaxial cables that provide interface connectors at the bottom of the mast.

Optional Equipment:

A crank-up or pneumatic telescoping mast, foot pump and electric compressor.

Spec Sheet


Wind 86 MPH operational, no ice
Humidity MIL-STD-810, Procedure III
Rain 4 IN/HR, 40 MPH Winds
Salt Fog MIL-STD-810, Method 509.2, Procedure I
Input Connector Type N
Azimuth Patterns, 2 to 16 MHz +/- 1.0 dB Omni
Back Lobes +/- 2.4 dB Omni
Power Capability 1 kW Avg / PEP
Snow and Ice 115 MPH, Survival
Altitude Operation 12,000 ft
Frequency Range 2 to 30 MHz
VSWR, 5 to 30 MHz 2.0:1
VSWR, 2 to 5 MHz 2.3:1 Max
Weight 200 lbs
Deployed Size, Feet 260 ft diameter
Gain -3.2 dBi Minimum , 0 dBi Avg
Shock, Stowed 33g, 33ms, ½ sine
Solar Loading 360 BTU/HR/FTsq at +65 C
Stowed Size, #1 Transit Frame, Inches 38 L x 15 W x 13.62 H
Isolation 40 dB Typical, 22 dB Minimum
Altitude Storage 40,000 ft
Input Impedance 50 Ohms Unbalanced
Temperature Operation -54C to 65C
Temperature Storage -62C to 71C
Stowed Size, #2 Transit Frame, Inches 76 L x 15 W x 13.62 H
Elevation Pattern, Above 8 MHz Gain Max at Zenith
Polarization Horizontal and Vertical
Finish MIL-P-53039, Green 383 Carc Paint
Fungus MIL-STD-810, Method 508.3
Sand MIL-STD-810, Method 510.2, Procedure II
Vibration MIL-STD-810, Procedure I
Elevation Pattern, Below 8 MHz Not lower than 20 degrees