Best Marine VHF Antenna for UK Boats: A Buyer's Guide
A good VHF radio paired with a poor antenna is a poor VHF radio. The antenna decides how far your Mayday reaches, how clearly you hear the Coastguard and whether a marina picks up your call from the harbour entrance. Here is how to choose the best marine VHF antenna for your boat.
Start With Gain: 3 dB or 6 dB?
Gain describes how tightly an antenna focuses its signal towards the horizon. More gain means a flatter pattern and more range on a level vessel. On a boat that heels, though, that flat pattern tilts with the hull, sending part of the signal into the water and part into the sky.
- 3 dB antennas are the standard choice for sailing yachts. The broader pattern keeps working when the boat heels.
- 6 dB antennas suit motorboats, RIBs and workboats that sit level, where the extra range towards the horizon pays off.
Height Matters More Than Anything
VHF is line of sight. The higher the antenna, the further it can see. On a sailing yacht, a masthead antenna gives the best range by a wide margin. On a motorboat, mount it as high as the arch, hardtop or radar mast allows. As a rough guide, doubling antenna height adds around 40 per cent to the distance to the radio horizon.
It is worth carrying a backup. If you lose the mast, you lose a masthead antenna with it. A second antenna on the pushpit or arch, or an emergency antenna in the grab bag, keeps you on air.
Length and Construction
Fibreglass whip antennas are the norm on leisure craft. Longer antennas generally offer more gain and better efficiency, but add windage and need a solid mount. Look for UV-stable fibreglass, sealed internal connections and a stainless steel or brass base fitting.
Sharing With AIS
AIS operates on 161.975 and 162.025 MHz, close to the marine VHF band, so it can share your VHF antenna through an active splitter. That saves space and cost, but you lose redundancy and add a component that can fail. A dedicated AIS antenna such as the AIS54, a 4 dB AIS glass fibre antenna, gives each system its own path and keeps AIS running if the VHF antenna is damaged.
Cable and Connectors
- Use low-loss coax for masthead runs. Thin cable over 20 metres can lose a significant share of your transmit power.
- Minimise joints. Every connector and deck gland adds loss and a potential leak point.
- Seal everything. Salt water and corrosion are the most common causes of VHF faults. Use self-amalgamating tape on exposed connectors.
Our guide to marine antenna installation mistakes covers the faults we see most often.
Renair Marine VHF Options
- VHF73: a 3 dB VHF fibreglass antenna, 1.26 m long, and a dependable all-round choice for sailing yachts.
- VHF73N and VHF74: alternative versions in the same family. Check each product page for length, gain and connector to match your installation.
- AIS54: a dedicated 4 dB AIS antenna with fixed 10 or 20 m cable.
- Stainless steel mast/rail mount for pushpit and arch installations.
For a refresher on which channels you will be using, see our guide to UK marine VHF channels.
Tell us about your boat and where you want to mount the antenna, and we will recommend the right setup: renair.co.uk/contact-us.
Frequently Asked Questions
What gain marine VHF antenna should I buy for a sailing yacht?
A 3 dB antenna is the usual choice for sailing yachts, because its broader pattern keeps working when the boat heels.
Can my VHF and AIS share one antenna?
Yes, with an active splitter. A separate AIS antenna gives better redundancy if your budget and space allow.
How far will my marine VHF reach?
Range depends mostly on antenna height at both ends. Boat to boat, expect roughly 10 to 15 nautical miles with masthead antennas, and further to a high shore station.
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