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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?
rosco4271 is offline   Reply With Quote
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.
KeelMe is offline   Reply With Quote

head, mast, Refurb

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