Model SPQ-230
HF Four Arm Multiport Spiral Antenna 2-30×4 MHz 160 ft

Frequency Range: 2-30 MHz, 2-30 MHz, 2-30 MHz, 2-30 MHz
Gain: 7 dBi
VSWR: 2:1, 4:1, 2:1, 2:1
Polarization: Elliptical, Vertical, Horizontal, Elliptical
Pattern: Omni, Omni, Omni, Omni
Size: 160′ H x 155′ L x 155′ W

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SKU: SPQ-230 Categories: , Tag:



The SPQ-230 HF spiral antennas are designed for installations where space is at a premium and the communication requirement is for operation on several circuits simultaneously. The antennas are four arm spirals that are fed with a four port hybrid designed specifically to provide two short range and two medium range patterns simultaneously. The relatively small installation area and multifunctional operational capability makes these antennas ideally suited for congested antenna fields or sites where space is severely limited. The antenna is protected under US Patent 5189434.


The SPQ-230 operates as four (4) Separate antennas integrated into one structure. All inputs are isolated from each other permitting full duplex operations on two separate circuits and a medium range skywave circuit simultaneously or three half duplex and one receive only circuit. The spiral is a four arm equiangular design that is would on a pyramidal structure formed by a central tower and four catenaries. The catenaries are dielectric with prepositioned element attachment clamps. The elements are constructed from jacketed cables that provide protection from the environment. The elements are terminated in resistive loads. The tower is a bolted aluminum structure.

Spec Sheet


Elevation Sea Level to 12,000 Ft
Power, kW 1
Wind 100 mph, no ice
Humidity 100%
Dimension (L x W x H) 160′ x 155′ x 155′
Rain 4 in/hr, 40 mph winds
Isolation (between input ports) 25 dB
Impedance 50 Ohms
Temperature -60°F to +160°F
Lightning MIL-E-4158E
Corrosion Protection MIL-STD-454K
Salt Fog MIL-STD-810 Method 509.2
Sand & Dust MIL-STD-810 Method 510.2 Pro II
Azimuth Pattern Omni
Input Connector Type “N”
Port 1 Directive Gain 7
Port 1 Polarization Elliptical
Port 1 Frequency 2-30
Port 1 VSWR 2:1
Port 2 Directive Gain 7
Port 2 Polarization Vertical
Port 2 Frequency 2-30
Port 2 VSWR 4:1
Port 3 Directive Gain 7
Port 3 Polarization Horizontal
Port 3 Frequency 2-30
Port 3 VSWR 2:1
Port 4 Directive Gain 7
Port 4 Polarization Elliptical
Port 4 Frequency 2-30
Port 4 VSWR 2:1