Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 31-10-2012, 17:17   #1
Registered User

Join Date: Sep 2011
Boat: Lagoon 380
Posts: 6
VHF Antenna for Catamaran

I need to replace the rusted vhf antenna on my 38' catamaran. From what I gather, sailboats generally use antennas rated 3 db because they roll / heel.

My question: do cats, with their more stable base, still use 3 db-rated anennas or do they bump up to 6 db...

Also, any specific VHF antennas recommended would be greatly appreciated. (I hope to install AIS as well, if that matters.)

Thanks in advance.
Cteevan is offline   Reply With Quote
Old 01-11-2012, 01:22   #2
Registered User

Join Date: Nov 2012
Location: Australia
Boat: Rogers 10 Catamaran
Posts: 3
Re: VHF antenna for catamaran

I just finished installing a Glomex VHF whip on the targa bar of my 35' cat. It is a multi purpose setup:- primarily for AIS but also as backup for masthead VHF and AM/FM radio. It is a 6db 2.7M pole on SS base welded to a larger plate. A Glomex 3-way splitter (requires 12v) provides AIS, VHF (2-way) and AM/FM outlets. It is still early days but during installation I got an alarm as soon as I powered my instruments on. I cursed thinking that something was mis-wired but it had immediately acquired a valid threat. I was in the marina and just outside a search & rescue boat was approaching at 17kts.
I have not yet checked the VHF as I need to run a longer cable to it, but AM/FM also works well.
I purchased this kit on advice that a broader band VHF antenna will also be fine for AIS.
makjeng is offline   Reply With Quote
Old 01-11-2012, 07:11   #3
Senior Cruiser
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,043
Images: 12
Re: VHF Antenna for Catamaran

A rusted antenna? Usually these are SS or fiberglass.

6db will work on your cat, but I doubt you will see much practical difference over a 3db if mounting it on the masthead. The tradeoff will be the longer length of the 6db - if you are on the ICW in the US, check your total mast/antenna height.

Personally, I don't think there is much difference among the antenna manufacturers. Your largest gain will be in installing good coax, good fittings and properly soldering. After that, all similar antennas are essentially the same.


You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote

antenna, catamaran, vhf

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Long-Distance WiFi Device jcmoon Marine Electronics 1344 31-05-2015 05:50
Virgin at Tuning Masthead VHF Antenna . . . akio.kanemoto Marine Electronics 36 22-11-2013 15:22
VHF / UHF HAM Radio Antenna ... and AIS? s/v Jedi Marine Electronics 63 25-08-2013 07:04
Old dedicated DSC antenna ? jr_spyder Marine Electronics 0 02-02-2012 19:29
Emergency VHF Antenna Question Chief Engineer Marine Electronics 39 22-10-2011 10:49

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 17:35.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.