Marine and Offshore Antenna Solutions for Vessels and Offshore Platforms
A vessel is a metal box that moves, rolls and corrodes. Antennas mounted on it face salt fog, constant motion, and a superstructure that blocks and reflects the signal. RF element supplies fiberglass omni antennas, VHF antennas and 4G/5G MIMO units for vessels, barges and offshore platforms, with housings and hardware chosen for a salt-laden environment.
Salt, motion and a metal superstructure
Salt fog attacks every interface
Marine air corrodes connectors, screws and untreated aluminium within a season. Stainless fasteners, sealed interfaces and a fiberglass radome are the baseline, and the most common field failure is water ingress at the connector rather than a fault in the antenna itself.
The vessel rolls and the pattern moves
A directional antenna on a rolling vessel changes its elevation angle continuously. Omnidirectional antennas with a broad vertical pattern tolerate roll far better, which is why marine installations favour omni designs even when a directional antenna would give more gain on a stable platform.
The superstructure shadows the antenna
Masts, funnels and bridge structures create deep shadows and strong reflections. Height and position on the vessel matter more than the antenna model: an antenna mounted behind the funnel will underperform whatever its specification.
Antenna selection by deployment case
Marine installations usually need three services: VHF for voice and AIS-class traffic, cellular for data, and Wi-Fi for onboard distribution. The table maps those to the antenna families we build; confirm the exact marine VHF channel plan for your flag state.
| Antenna type | Frequency range | Gain | Typical use |
|---|---|---|---|
| Fiberglass omni | 3400-3800 MHz | 11 dBi | 5G n78 coastal and nearshore coverage |
| VHF omni | 144-174 MHz | 3 dBi | VHF voice and AIS-band coverage |
| MIMO omni | 698-2700 MHz | 4-6 dBi | Cellular data on vessels and platforms |
| Dual-band omni | 2.4-2.5 / 5.15-5.85 GHz | 7.5-8 dBi | Onboard Wi-Fi distribution |
Band, gain and polarization trade-offs
Roll is the deciding factor offshore. An 11 dBi omni with a broad vertical pattern holds a link through 10-15 degrees of roll; a 20 dBi directional antenna loses it at the first swell, which is why gain takes second place to pattern stability on a vessel.
Fiberglass radomes cost more than aluminium but remove the corrosion path. On a vessel that is washed down regularly, the difference between a coated aluminium housing and a fiberglass one shows within about two seasons, usually at the mounting interface first.
Recommended antennas
These four models cover VHF, cellular and onboard Wi-Fi. The fiberglass omni is the usual choice for a mast because the radome does not corrode, and the VHF model covers the 156-162 MHz marine band inside its 144-174 MHz range.
5G n78 Omni Antenna
VHF Omni Antenna
4G LTE MIMO Omni Antenna
Dual Band WiFi Omni Antenna
Frequency, gain, beamwidth and connector values are taken from the linked product specification tables. Confirm the final configuration against the datasheet before ordering.
Installation and deployment notes
Marine installation is governed by the vessel, the flag state and the class society. The points below are practical ones that apply regardless of those rules.
- Mount as high and as clear of the superstructure as possible; the funnel and the bridge are the main shadow sources.
- Use stainless fasteners and seal every connector with self-amalgamating tape plus a drip loop.
- Keep VHF and cellular antennas separated vertically to reduce interference and intermodulation.
- Check the mast for corrosion at each dry-docking, not only when a link fails.
- Bond the mast and the coax entry to the vessel earth; a floating shield is a common cause of noise.
Frequently asked questions
Does the VHF antenna cover the marine band?
The antenna covers 144-174 MHz, which includes the 156-162 MHz marine VHF band. Channel spacing and licensing are matters for the radio and the flag state, not for the antenna, but confirm the exact operating channels with your supplier before ordering.
Why fiberglass instead of aluminium?
A fiberglass radome does not corrode in salt air and does not require painting. Aluminium is lighter and cheaper, but in a marine environment it needs a properly maintained coating, and any breach becomes a corrosion point. For a mast-mounted omni, fiberglass is the usual choice.
Can a directional antenna be used on a vessel?
It can for a fixed offshore platform, where the mounting is stable. On a vessel that rolls, a directional antenna changes its elevation angle continuously and the link drops; an omni with a broad vertical pattern is more reliable even at lower gain.
Do you supply antennas with marine certifications?
We do not hold class society type approvals. We supply the antenna and its electrical and mechanical data, and the vessel or yard carries the approval with the class society.
Related technical reading
Related industries
At sea the enclosure and the mounting decide whether the link survives. The same engineering appears onshore.
What to send for an antenna shortlist
Send these five items and we can propose models with pattern data instead of a catalogue list.
- Vessel type, layout and mast position
- Services and bands required
- Mounting height and available space
- Flag state and class society requirements
- Exposure: coastal, offshore or platform
Send your layout, get an antenna shortlist
Send the vessel layout, the mast position and the services required, and we will propose antenna types and mounting positions for the link budget.
Request a quotation