20–500 MHz Wideband Army Green Fiberglass Omni Antenna, Integrated N-Male, IP67, KSANT-12334-A

Some radio equipment has to listen and transmit across a span that used to require four or five separate antennas. Tactical radios, wideband receivers and broadband scanners all live across the HF, VHF and low UHF range, and the demand for one radiator that covers the whole span has never been higher. Integrators are constantly challenged to keep the mast clean, because every extra antenna adds a feed, a clamp, a lightning path and a maintenance point. The solution lies in a single wideband fiberglass radiator that trades a little gain for an enormous frequency range. We are proud to introduce the 20–500 MHz Wideband Army Green Fiberglass Omni Antenna, model KSANT-12334-A, a 600 mm linear-polarized radiator engineered for broadband radio, tactical communication and wideband monitoring.

This antenna represents a deliberate trade: coverage instead of gain. Its core advantage is the 20–500 MHz span in a single 600 mm radome of 32 mm diameter, finished in army green and terminated in an integrated N-male connector. The whole span is covered at 50 Ohm with VSWR under 2.5, measured gain runs from -5 to -1.5 dBi across the band, and the horizontal pattern is a full 360° with out-of-roundness held to ±2 dB. Power handling is 100 W, the radome is sealed to IP67, the element is DC grounded, and it is rated for wind of 36.9 m/s across −45 °C to +85 °C. It is the practical choice for equipment that expects one antenna for the whole low spectrum.

Technical Excellence: The Core Advantage

The antenna's performance rests on three pillars: a 25:1 frequency span in one part, a match that stays flat across it, and a wide vertical beam that suits broadband reception.

A 25:1 Frequency Span in One Radome

The design covers 20 to 500 MHz, which spans the upper HF band, VHF and the lower UHF band in a single part. That is the headline trade of a wideband antenna: instead of four masts at four resonant bands, one 600 mm radome feeds the radio. For an integrator this removes four feedlines, four clamps, four lightning paths and a whole class of intermodulation problems. Measured efficiency rises from 9.1% at 20 MHz to about 22% on average across the band, which is exactly what physics says a broadband non-resonating radiator should deliver; it is not a high-gain resonant antenna, and it is not pretending to be one.

VSWR Under 2.5 Across the Whole Span

Keeping a match below 2.5 from 20 to 500 MHz is the hard part of the design. The datasheet specifies VSWR <2.5 under grounding test conditions, and the stored trace marks 1.44 at 20 MHz and 1.86 at 500 MHz, with return loss of 14.9 dB and 10.4 dB at those two points. That margin is what lets a broadband receiver or transmitter sweep across the whole span without retuning, and it keeps reflected power low enough that the transmitter's protection circuit stays quiet even at the band edges. Impedance is 50 Ohm nominal throughout, so no matching network or ATU is needed between the antenna and the radio.

Wide Vertical Beam, IP67 Seal and an Integrated N-Male Feed

The vertical beamwidth is 40–89°, which is broad rather than narrow: the antenna behaves like a dipole that covers every elevation angle, rather than a collinear that concentrates on the horizon. That is the right pattern for wideband reception, where the signal may arrive from any direction. The datasheet carries a dedicated IP67 test report, so the seal is a tested claim rather than "weather-resistant" marketing language. Maximum power is 100 W, which covers tactical transmitters and broadband amplifiers. The connector is integrated into the base, an N-male that screws directly onto the feeder, and the element is DC grounded so static charge drains to the mast. Mechanical qualification is stated rather than assumed: a ≥200 N pull force test, a 1 m drop test, vibration from 10–55 Hz at 0.35 mm displacement and 50.0 m/s² over 30 sweep cycles, and voltage resistance of 1.5 kV insulation, 1.5 kV sheath and 0.5 kV insulation-to-sheath. The product is RoHS compliant.

Versatile Application Scenarios

The combination of a 20–500 MHz span, IP67 sealing and a single N-male feed makes this antenna useful wherever one mast has to serve many radios.

Tactical and Wideband Radio

Tactical and field communication: one antenna on a mast covers the whole operational low band, so a vehicle or a shelter does not need a separate radiator for each radio system.

Wideband transceiver and multi-radio sites: navy, border and public-safety installations that run several bands at once use one radome instead of an antenna farm.

Wideband Monitoring and Scanning

Wideband receivers and spectrum scanning: monitoring stations need a flat match across the band they sweep, and this antenna delivers one feedline for the whole scanner range.

EMC and test range support: laboratories and field test teams use a single known radiator from HF to low UHF for radiated testing and measurement.

Outdoor Unattended Sites

Fixed and temporary sites: the IP67 seal and army green finish suit field positions, camouflaged deployments and remote equipment that has to survive weather and dust without maintenance.

Mobile and vehicle mounts: the 0.45 kg weight and 600 mm length let it be mounted on a vehicle roof or a portable mast for temporary operations.

Conclusion: The Future of Wideband Low-Spectrum Coverage

The 20–500 MHz Wideband Army Green Fiberglass Omni Antenna, KSANT-12334-A, is more than a passive component. It is the part that turns a four-antenna mast into a single feed. By covering 20–500 MHz at 50 Ohm with VSWR <2.5, holding a full 360° pattern with out-of-roundness within ±2 dB, and delivering 100 W behind an IP67-sealed, DC-grounded N-male feed, it gives integrators a simple mast for complex radio environments. Its measured gain of -5 to -1.5 dBi is the honest price of a 25:1 span, and the datasheet says so plainly rather than dressing it up. The 600 mm radome at 32 mm diameter, 0.45 kg weight, army green finish and a −45 °C to +85 °C operating range make it deployable in the field. For any radio that needs one antenna from HF to low UHF, this antenna is the practical choice.