Model MAS-5
HF Multiport Antenna w/RLPA 2-30×2/4-30×3 MHz 106 ft

Frequency Range: 2-30, 4-30, 4-30, 2-30, 2-30 MHz
Gain: 7, 7, 7, 7, 9-12 dBi
VSWR: 2:1, 3.5:1 max, 2:1, 2:1, 2:1
Polarization: Elliptical, Vertical, Horizontal, Elliptical, Horizontal
Pattern: Omni, Omni, Omni, Omni, Directional
Size: 106′ H x 100′ L x 100′ W

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The MAS 5 multiport antenna system is designed for installations where space is at a premium and communication requirements are for several circuits simultaneously having a variety of path lengths. It provides five independent antenna modes. Two of these modes are NVIS modes for short range skywave circuits; two are low angle modes for medium range circuits; and the fifth port is a high gain rotatable log periodic antenna for long range circuits. The relatively small installation area together with the five independent antenna ports makes the MAS-5 ideally suited for congested antenna fields or sites where space is severely limited.

The MAS-5 Multiport Antenna system combines the four omnidirectional port capability of the SPQ-330 with the Rotatable Log Periodic Array (RLPA) features of LPH-24 to provide a truly five port antenna system occupying the space normally required for a single antenna. All five ports may be used independently for transmit or receive. The RLPA has high gain, azimuth selection (computer control optional) and permits communication between a fixed site and mobile station such as ships and aircraft. It also features a torque tube and base-located rotator thereby providing high reliability and easy accessibility for inspections and maintenance. The spiral is a four-arm equiangular design wound on a pyramidal structure formed by the center support tower and four catenaries. It is fed using an AP four-port hybrid and is protected under US Patent 5189434.

Spec Sheet


Port 5 Rotation Speed .3 RPM
Humidity 0 to 100%
Input Connector 1 5/8″ EIA
Power, kW 10
Port 5 Primary Power 115 VAC
Port 5 Directive Gain 12
Wind 120 mph, no ice; 80 mph, 1/4″ ice
Port 1 VSWR 2:1
Port 3 VSWR 2:1
Port 4 VSWR 2:1
Port 5 VSWR 2:1
Port 1 Frequency 2-30
Port 4 Frequency 2-30
Typical Isolation, dB 25
Port 2 VSWR 3.5:1 Max, 2.5:1 Typical
Rain 4 in/hr., 40 mph winds
Port 2 Frequency 4-30
Port 3 Frequency 4-30
Port 5 Frequency 4-30
Input Impedance 50 Ohms
Temperature-Humidity -60 degrees F to 160 degrees F
Port 1 Directive Gain 7
Port 2 Directive Gain 7
Port 3 Directive Gain 7
Port 4 Directive Gain 7
Port 5 Azimuth Pattern Directional
Port 1 Polarization Elliptical
Port 4 Polarization Elliptical
Erected Dimensions, H x L x W Height 106 ft; length 100 ft; width 100 ft
Port 3 Polarization Horizontal
Port 5 Polarization Horizontal
Port 5 Application Long Range
Port 2 Mode Low Angle
Port 3 Mode Low Angle
Port 2 Application Medium Range
Port 3 Application Medium Range
Lightning MIL-E-4158E
Corrosion Protection MIL-STD-454K
Fungus MIL-STD-454K Reqt 4
Salt Fog MIL-STD-810 Method 509.2
Sand & Dust MIL-STD-810 Method 510.2 Pro II
Port 1 Rotation Speed N/A
Port 2 Rotation Speed N/A
Port 3 Rotation Speed N/A
Port 4 Rotation Speed N/A
Port 1 Mode NVIS
Port 4 Mode NVIS
Port 1 Azimuth Pattern Omni
Port 2 Azimuth Pattern Omni
Port 3 Azimuth Pattern Omni
Port 4 Azimuth Pattern Omni
Port 5 Mode RLPA
Elevation Coverage Sea level to 12,000 ft
Port 1 Application Short Range
Port 4 Application Short Range
Port 2 Polarization Vertical