Description
COMAR AS350 AIS VHF Antenna Splitter allows an AIS transponder or AIS receiver and VHF radio to share a single marine VHF antenna.
The COMAR AS350 AIS VHF Antenna Splitter is a compact professional antenna sharing solution for yachts, powerboats, workboats and commercial vessels where fitting a second AIS antenna is difficult, costly or impractical.
COMAR AS350 AIS VHF Antenna Splitter
Share one antenna. Keep your AIS and VHF installation clean, compact and professional. The AS350 automatically manages AIS and VHF antenna sharing, with VHF transmissions prioritised for safe marine communication.
AIS / VHF Splitter
Class B Compatible
12 / 24V DC
📡 One Antenna System
Allows AIS equipment and VHF radio to share a single marine VHF antenna.
⚡ VHF Priority
VHF transmissions are prioritised to support safe voice communication.
🚢 Space Saving
Reduces extra antenna mounts, cable runs and deck penetrations.
🔧 Installer Friendly
Supplied with VHF and AIS patch leads for a cleaner installation.
COMAR AS350 AIS VHF Antenna Splitter Benefits
The COMAR AS350 AIS VHF Antenna Splitter is useful where a dedicated AIS antenna is not practical. It allows a vessel’s existing VHF antenna to be used by both the onboard VHF radio and AIS transponder or AIS receiver.
A dedicated AIS antenna remains the best option for maximum separation and continuous AIS visibility, but many vessels have limited mounting space. The AS350 gives installers a practical alternative for compact vessels, refits and tidy marine electronics upgrades.
Technical Specifications
COMAR AS350 AIS VHF Antenna Splitter Applications
AS350 vs Installing a Separate AIS Antenna
Connection Overview
Installation Advice
The AS350 should be installed below deck in a dry location. Check the existing VHF antenna, coaxial cable and connectors before installation, as an antenna splitter cannot correct poor antenna performance, water ingress, damaged coax or high-loss RF connections. Use a suitable 1A fuse or circuit breaker on the DC supply.
Technical Resources
Learn More About AIS Antenna Systems
- AIS Splitter vs Dedicated AIS Antenna
- Marine AIS Splitter Installation Guide
- Do I Need a Separate AIS Antenna?
- Where to Mount an AIS Antenna
- AIS Antenna Cable Loss Explained
- AIS Receiver vs AIS Transponder
- What Is AIS on a Boat?
- Marine VHF Radio Installation
- VHF Antenna Cable Loss
- COMAR AIS Receiver vs AIS Transponder
COMAR AS350 AIS VHF Antenna Splitter FAQs
What does the COMAR AS350 do?
The COMAR AS350 allows an AIS transponder or AIS receiver and VHF radio to share a single marine VHF antenna.
Can an AIS receiver use the AS350?
Yes. The AS350 is suitable for AIS Class B transponders and AIS receivers, making it useful for both transmit-and-receive AIS systems and receive-only AIS installations.
Does the AS350 work with Class B SOTDMA AIS transponders?
Yes. The AS350 is compatible with Class B CSTDMA and Class B SOTDMA AIS transponders. For safety-critical installations where continuous AIS visibility is essential, a dedicated AIS antenna may still be preferred.
What happens during a VHF transmission?
VHF transmissions are prioritised. While the VHF radio is transmitting, AIS transmissions may be temporarily paused until the antenna is available again.
Can I install the AS350 above deck?
No. The AS350 is rated IP40 and is intended for dry below-deck installation.
Will the AS350 improve AIS range?
No. AIS range is mainly affected by antenna height, coaxial cable loss, connector quality and local conditions. The AS350 is designed to share an antenna, not to boost AIS range.
Who should install the AS350?
The AS350 should be installed by a competent marine electronics installer familiar with AIS, VHF radios, RF connectors and marine DC power systems.
The COMAR AS350 AIS VHF Antenna Splitter is designed for professional AIS installations that require reliable antenna sharing between AIS and VHF communication systems.
Need Help Choosing Between a Splitter and Separate AIS Antenna?
F&C Marine can help with AIS antenna planning, splitter installation, VHF antenna checks, coaxial cable selection and full marine electronics integration.
Related COMAR AIS Products
- COMAR AIS Systems
- COMAR AIS Transponders
- COMAR AIS Receivers
- T350 Class B SOTDMA AIS Transponder
- COM100 Lightweight OEM AIS Receiver
- I300W NMEA to WiFi Interface Converter
The COMAR AS350 AIS VHF Antenna Splitter is manufactured by COMAR Systems, a specialist developer of AIS receivers, AIS transponders and marine antenna integration products.
