RG58 vs RG213 vs RG214 vs LMR400 for Marine AIS & VHF
RG58 vs RG213 vs RG214 vs LMR400 is one of the most important cable comparisons for marine AIS and VHF installations. The right coax cable can improve signal strength, reduce cable loss and support more reliable offshore communication.
This guide compares marine coax cable options for short leisure runs, masthead sailboat installations, offshore systems and commercial vessels.
Quick Answer: Which Marine Coax Cable Should You Use?
For most serious marine AIS and VHF installations, RG213 is the best all-round choice. It offers lower loss than RG58 while remaining practical to route on many vessels.
RG58 is suitable for short compact installs. RG214 is useful for RF-sensitive or commercial environments due to its double shielding. LMR400 offers very low loss but is often over-specified for normal AIS and VHF use because it is larger, stiffer and harder to install.
RG58 vs RG213 vs RG214 vs LMR400: Main Differences
| Cable Type | Best Use | Strength | Main Limitation |
|---|---|---|---|
| RG58 | Short leisure runs | Flexible and easy to route | Higher signal loss over distance |
| RG213 | Most offshore AIS and VHF installs | Good balance of loss, durability and practicality | Larger than RG58 |
| RG214 | Commercial and RF-sensitive installs | Double shielding for interference resistance | More expensive and stiffer |
| LMR400 | Very long low-loss cable runs | Lowest loss option | Stiff, large and often over-specified for normal marine installs |
Why Coax Cable Loss Matters for AIS and VHF
Every metre of coax cable introduces signal loss. On short cable runs this may be minor, but on masthead AIS and VHF installations the loss can become significant.
Cable loss affects both transmission and reception. A high-quality AIS transceiver or VHF radio will not perform properly if signal strength is lost through poor coax, bad connectors or long high-loss cable runs.
Lower cable loss is especially important for masthead antennas, offshore yachts, commercial craft and long cable runs.
1. RG58 Marine Coax Cable
RG58 is commonly used on small boats, compact installations and short cable runs. It is flexible, easy to route and cost-effective, which makes it useful for simple AIS or VHF installations.
Best uses for RG58
- Short cable runs
- Small leisure vessels
- Compact rail-mounted antennas
- Temporary or simple installations
- Low-cost coastal systems
Installer note: RG58 is not ideal for long masthead runs because cable loss increases quickly with distance. For sailboat mast installations, RG213 or RG214 is usually a better choice.
2. RG213 Marine Coax Cable
RG213 is the practical all-round marine coax cable for many AIS and VHF installations. It offers lower signal loss than RG58 while remaining manageable for most professional marine installations.
Best uses for RG213
- Masthead AIS and VHF antenna runs
- Offshore yachts
- Longer leisure vessel installations
- AIS splitter systems
- Professional marine VHF installations
For many yachts and workboats, RG213 provides the best balance between performance, durability, cable size and installation practicality.
3. RG214 Marine Coax Cable
RG214 is similar in size to RG213 but normally uses double shielding. This makes it useful where interference resistance is important.
Best uses for RG214
- Commercial vessels
- RF-dense installations
- Radar-heavy environments
- Long masthead runs where shielding matters
- Professional AIS and VHF systems
RG214 is a strong choice where shielding and RF noise resistance matter as much as cable loss.
For more on interference control, read our Marine RF Interference Explained guide.
4. LMR400 for Marine AIS and VHF
LMR400 provides very low signal loss and can be useful for specialist long-run marine communication systems. However, it is not normally required for most standard AIS or VHF installations.
Where LMR400 makes sense
- Very long antenna cable runs
- Large yachts
- Commercial vessels
- High-performance offshore systems
- Installations where every dB matters
Practical installer view: LMR400 can be over-specified for many marine AIS and VHF systems. It is larger, stiffer and harder to route than RG213 or RG214, especially through masts, tight lockers and compact cable routes.
Masthead Coax Cable Runs on Sailboats
Sailboat masthead antenna installations are where cable choice becomes especially important. The cable run can be long, with the route passing down the mast, through a deck gland and into the nav station or AIS splitter.
For masthead AIS and VHF antennas, RG213 is often the most practical choice. RG214 may be preferred where shielding is important. LMR400 can be considered for very long runs, but only where its size and stiffness can be managed properly.
See also our Marine AIS & VHF Antenna Placement Guide.
Good vs Poor Marine Coax Installation
Cable type matters, but installation quality is just as important. Poor sealing, corroded connectors, tight bends and crushed coax can reduce performance even when good cable is used.
Good marine coax installation practice
- Use waterproof RF connectors
- Create drip loops before cable entry points
- Avoid tight bends
- Use proper strain relief
- Seal deck glands correctly
- Inspect connectors regularly
Poor installation faults
- Corroded connectors
- Exposed coax braid
- Crushed cable
- Poor deck gland sealing
- Unsupported cable runs
- Water ingress inside the cable
Read more in our AIS Antenna Cable Loss guide.
Which Coax Cable Should You Choose?
RG58 is usually adequate where the cable run is short and easy to inspect.
RG213 is normally the best practical marine AIS and VHF cable choice.
RG214 is useful where shielding and interference resistance are priorities.
LMR400 can be considered where low loss matters more than flexibility.
Marine Coax Cable and AIS Range
Poor coax cable is a common cause of weak AIS range. If your AIS range is poor, check antenna height, cable type, cable length, connector condition and splitter installation before replacing the AIS transceiver.
For full troubleshooting, see Why Is My AIS Range Poor?.
Related Marine RF Installation Products
Explore our full range of marine coax cable assemblies, AIS Antennas, Marine VHF Antennas, AIS Splitters and marine antenna mounts.
External Cable Reference
For general coaxial cable background, see the coaxial cable technical overview.
Need Help Choosing Marine Coax Cable?
The best cable depends on vessel type, antenna height, run length, routing space and required performance. For most serious marine AIS and VHF installations, RG213 is the practical all-round choice, while RG214 and LMR400 suit more specialised systems.
RG58 vs RG213 vs RG214 vs LMR400 FAQ
What is the best coax cable for marine AIS?
For most marine AIS installations, RG213 is a strong all-round choice. RG58 is suitable for short runs, RG214 is useful for shielded commercial installs and LMR400 is best reserved for specialist long cable runs.
Is RG58 suitable for AIS and VHF?
RG58 can be suitable for short leisure installations, but it is not ideal for long masthead cable runs because signal loss increases with distance.
Is RG213 better than RG58?
Yes. RG213 normally has lower loss than RG58 and is better suited to longer marine AIS and VHF antenna runs.
When should RG214 be used?
RG214 is useful where improved shielding is required, such as commercial vessels, RF-sensitive installations and radar-heavy environments.
Is LMR400 overkill for marine AIS and VHF?
LMR400 can be over-specified for many standard AIS and VHF installations. It is useful for very long low-loss runs, but its larger size and stiffness can make installation more difficult.