200–400 MHz VHF UHF Fiberglass Omni Antenna, N-Male, Glossy Black, KSANT-11727-A

The VHF and lower UHF bands are where public-safety, industrial and fleet radios have lived for decades, and the demand for one radiator that covers the whole low band has never been higher. Site planners are constantly challenged to cover a depot, a campus or a worksite from one pole, on a band where the radios move in every direction and there is nothing to aim at. The solution lies in a single wideband fiberglass omni that takes the whole 200–400 MHz span. We are proud to introduce the 200–400 MHz VHF UHF Fiberglass Omni Antenna, model KSANT-11727-A, a 600 mm linear-polarized radiator engineered for VHF/UHF two-way radio, fleet communication and wideband monitoring.

This antenna represents a practical answer to a real installation: one radome of 32 mm diameter and 600 mm length, finished in glossy black and terminated in an integrated N-male connector. The 200–400 MHz span is covered at 50 Ohm with VSWR under 3.0, measured gain runs from -0.4 to 1.5 dBi across the band, and the horizontal pattern is a full 360° with roundness held to ±1.5 dB. Power handling is 100 W, the element is DC grounded, and the build is rated for wind of 36.9 m/s across −45 °C to +85 °C. It is the practical choice where one VHF mast has to serve every radio on site.

Technical Excellence: The Core Advantage

The antenna's performance rests on three pillars: a 2:1 low-band span, a round horizontal pattern, and a 100 W build for real VHF radios.

A 2:1 Span from 200 to 400 MHz

The design covers 200 to 400 MHz, which takes in the low VHF band, the high VHF band and the edge of the lower UHF band in a single part. That is the headline trade of a wideband VHF antenna: instead of two or three resonant masts at different sub-bands, one 600 mm radome feeds the radio. Measured efficiency holds around 53% across the band, and peak gain runs -0.4 to 1.5 dBi, which is the realistic figure for a dipole-class low-band radiator rather than a high-gain collinear. It is built for coverage and omnidirectional service, not for a long point-to-point hop, and the datasheet says so plainly.

Roundness Held to ±1.5 dB

A VHF omni usually gets away with a loose roundness tolerance, because the pattern changes as the radome gets longer electrically. This one is specified at ±1.5 dB, and the chamber measurements back it up: 0.41 dB at 200 MHz, 0.87 dB at 300 MHz and 0.98 dB at 400 MHz. That is a genuinely round pattern across the whole span, which matters when the radios can be anywhere around the mast and the system cannot rotate to compensate. The vertical beamwidth is 46–89°, which is broad enough to cover vehicles and walkie-talkies at ground level as well as rooftop units.

VSWR Under 3.0 and 100 W Handling

The specified match is VSWR <3.0 under grounding test conditions, and the stored trace marks the two band edges at 2.42 at 200 MHz and 2.71 at 400 MHz, with return loss of 7.6 dB and 6.7 dB at those two points. Inside the span the trace stays lower, which is what a wideband VHF transmitter sweeps against. Maximum power is 100 W, which is the honest figure for a VHF base station or a multi-carrier radio. The connector is an integrated N-male, the standard threaded interface on a mast, and the element is DC grounded so static charge drains to the mast. The radome is 32 mm in diameter, 600 mm long, glossy black, and weighs 0.525 kg. Mechanical qualification is stated rather than assumed: a ≥200 N tensile 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 200–400 MHz span, a round 360° pattern and 100 W handling makes this antenna useful wherever one VHF mast has to serve every radio on site.

VHF/UHF Two-Way Radio and Base Stations

Fleet and public-safety base stations: one omni covers a depot, a campus or a worksite on the VHF band without sector overlap, which is what a single-site two-way radio system needs.

Industrial and mining radio: factories, ports and mines run VHF multi-channel radio, and one wideband radome replaces several narrowband antennas on the same pole.

Wideband Receiving and Monitoring

Wideband receivers and spectrum scanning: monitoring stations need one feed across the low band they sweep, and this antenna delivers a single feedline from 200 MHz to 400 MHz.

Signal intelligence and measurement: field teams that move across VHF sub-bands use one known radiator, and the ±1.5 dB roundness keeps the azimuth reading honest everywhere around the mast.

Outdoor Fixed and Roof Installations

Street poles and light masts: the 0.525 kg weight and glossy black finish suit wall brackets, parapets and light poles where a panel would look intrusive.

Remote and unattended sites: the −45 °C to +85 °C range and 36.9 m/s wind rating cover outdoor cabinets that have to survive weather without maintenance.

Conclusion: The Future of Wideband VHF Coverage

The 200–400 MHz VHF UHF Fiberglass Omni Antenna, KSANT-11727-A, is more than a passive component. It is the part that turns a multi-antenna VHF roof into a single feed. By covering 200–400 MHz at 50 Ohm with VSWR <3.0, holding roundness to ±1.5 dB across a full 360°, and carrying 100 W behind an integrated N-male connector on a 600 mm glossy black radome, it gives site planners a mast they can predict before the survey. The 0.525 kg weight, 36.9 m/s wind rating and −45 °C to +85 °C operating range state its limits up front. For any VHF/UHF deployment that needs one antenna to serve every radio on site, this antenna is the practical choice.