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Old 07-04-2018, 16:25   #1
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Join Date: Feb 2015
Location: Mooloolaba
Boat: Herman Boro 50Ft
Posts: 23
Mast head refurb

Hi I am rerigging my mast and intend to fit the following on the head mast.

VHF antenna Shakespeare 5215
AIS Antenna Shakespeare 5215-AIS
TV/ radio Antenna Anten The00331
Mobile broadband antenna
Mast head Light Hella
Nasa Wireless Nasa Clipper Wind Speed & Direction System
Manual wind indicator Windex

Reading all the literature the VHF and AIS should not be on the same plane with in 1200mm. So I thought the AIS could be fitted upside down under the top spreader which is around 900mm long . Has anybody done that and would the side stay and mast interfere with the signal to much?
Also any thoughts on configuration?
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Old 10-04-2018, 20:09   #2
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Join Date: Apr 2018
Location: Coming to a Marina Near You
Boat: Hallberg-Rassy 49
Posts: 294
Re: Mast head refurb

The radio signal does not care what orientation the antenna is in. I have seen hundreds of vhf, ais, and 900mhz industrial antennas mounted upside down. Most of the time it is done for the same reason you are referring to.

I however have had great success with a Vesper AIS/VHF antenna. I've been using one for over a year and have no complaints. I can see class B AIS targets 8 miles away and class A 14 miles away. My VHF signal is just as good as it was before. Plus I didn't have to run two coax cables up the mast.

The mast will affect the signal of the antenna on the spreader but it's hard to say how much.
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