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.