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View Poll Results: Where is your primary VHF antenna?
Atop the mainmast 40 83.33%
Atop the mizzen 2 4.17%
At the spreaders, or on the mast but not at the top 0 0%
On a radar arch, dodger, bimini, or similar structure 4 8.33%
On a stanchion, rail, pulpit, pushpit, etc. 0 0%
On the cabin top or deck 2 4.17%
I use a handheld 0 0%
Voters: 48. You may not vote on this poll

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Old 08-08-2018, 23:34   #16
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Re: Where is your primary VHF antenna?

Quote:
Originally Posted by SV Bacchus View Post
Good info hello, ours is a transmit AIS and both are presently out of commission due to a lightening strike. I will ask the electronics repair folks about installing the antenna a little lower, that sound like a good idea!

I'm wondering, since both antenna mounts are at the same height, just opposite sides of the mast, could the AIS antenna use its same mount but mount the antenna upside down? Only the base of both antennas would be at the same level that way.
Antenna mounted upside down? Wouldn't that put the antenna parallel to the mast a few inches away from it? That would be a very bad location. On a spreader about 2/3 distance out from mast, is better.

Probably for those mast-deficient boats like sloops and cutters, a single VHF antenna at masthead, with a duplexer below decks to allow both AIS and VHF to use the same antenna, is a pricier but elegant solution.
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Old 09-08-2018, 00:58   #17
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Re: Where is your primary VHF antenna?

Atop the mast.
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Old 09-08-2018, 07:27   #18
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Re: Where is your primary VHF antenna?

For the primary vhf antena I would only ever use the masthead to get the antenna as high up as possible and use the largest wire I could cram up the mast. I have a second antenna on transom if something happens to the main (just unplug one and plug in the other) For some reason or another I seem to collect hand helds, I know where 3 are and there are 2 more kicking around here somewhere....No AIS though
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Old 09-08-2018, 10:59   #19
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Re: Where is your primary VHF antenna?

Waterman-
Yes, adjacent to the mast would be no good, that would be transmitting directly into ground. Better if at least 1/4 wavelength away from it, which might mean at the end of a masthead truck, or out on the spreader...position depends on what's in the way up there.
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