The Digital Yacht CX4A is a commercial-grade 4-foot, 3 dB GRP antenna tuned for AIS and VHF, built for professional and larger-vessel installations that use a 1.25-inch commercial antenna base and long, low-loss coax runs.
Who it’s for
- Workboats, pilothouse boats, and superyachts
- Larger recreational boats with long cable runs
- AIS and VHF installs that need commercial-grade hardware
Key features
- 4 ft length, 3 dB stated gain
- GRP construction tuned for AIS/VHF
- Designed for a 1.25-inch commercial-grade base
- Pairs with low-loss 50-ohm coax such as RG-213
Choosing the right antenna
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Gain vs. beam: a 3 dB antenna has a wider signal pattern that keeps working when the boat rolls or heels, which suits sailboats and rough water. A 6 dB antenna concentrates the signal toward the horizon for more range on stable powerboats.
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Height is range: VHF is line-of-sight, so mounting the antenna higher does more for range than extra gain. On a sailboat, a short masthead antenna usually outperforms a long antenna mounted low.
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Coax matters: RG-58 is fine for short runs; RG-8X loses less signal over longer runs; RG-213 is the choice for long commercial runs. Keep connections dry and sealed.
Finish the install: antenna mounts · fixed-mount VHF radios · VHF antenna guide
Before ordering
Confirm you have or will buy a compatible 1.25-inch base, plus the connector, coax type, and cable length for your run.
What you're getting
Brand: Digital Yacht
Part Number: CX4A
Fulfillment: Ships from a U.S. marine distribution warehouse
Warranty: Manufacturer warranty terms vary by brand and product
Shipping & returns
Shipping options and charges are shown at checkout. Orders normally ship from a U.S. distribution warehouse. Manufacturer warranty eligibility and claim procedures vary by brand; review the manufacturer’s current terms before ordering. Questions can be sent to support@sonarkmarine.com.
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