This product comes from Alaris Antennas catalogues

HF Active Monopole


The HF active whip monopole antenna is designed for deployment on open ground or permanent installation and includes a deployable groundplane. The antennas’ radiation pattern is suitable for medium to long range HF monitoring. This antenna uses an operational amplifier as the active component of the antenna which operates from 9 kHz to 30 MHz The product features a passive bypass mode which comes into operation when the antenna is powered down. In this mode, the active matching and amplification circuitry is bypassed and the antenna operates as a completely passive receiving antenna.

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Frequency range 9 kHz - 30 MHz
Polarisation Vertical
Nominal input impedance 50 Ω
Connectors N-type female
Sensitivity in 1 Hz bandwidth Better than 1 µV/m
OP1 24 dBm
OIP2 43 dBm
OIP3 33 dBm
Input voltage 12.5 - 15.5 VDC
DC input current (max) Length
Length 2.9 m
Total mass 14 kg excluding packaging
Base dimensions 300 mm x 300 mm
Groundplane diameter 6000 mm
Mounting method Free-standing on the ground; Levelling feet provided; Can be bolted to a concrete plinth

    Product Applications

    Signals Intelligence
  • Radio Direction Finding
  • C-ESM

    Design Features

  • 9 kHz to 30 MHz frequency range Rugged Quick deployment time Self-contained groundplane Glass fibre insulated radiator Lightning induced surge and static protection Passive bypass mode option