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What kind of antennae is this

Old 05-27-2020, 11:41 AM
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Default What kind of antennae is this

So I have never been happy with the range of my 4 foot digital antennae and I dint want an 8 footer in the top due to bridge issue. So we went out to dinner the other day at a marina and I noticed the new tow boat US boat had only one very small antennae on the entire boat. It looks like an old quarter gain antennae used in plain police cars but it must have great range for Towboat US to use it in their brand new boat. It’s only about 2 foot long

Old 05-27-2020, 11:46 AM
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Could be Metz or GAM
Old 05-27-2020, 11:48 AM
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Originally Posted by Gmack View Post
Could be Metz or GAM
could you be more specific? Does it perform as well as 8 footer?
Old 05-27-2020, 11:57 AM
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Sorry, thought you were looking for brand. I’ve never used that specific antenna. I can say the similar Shakespeare has worked great when I used it on 2 different boats
Old 05-27-2020, 11:58 AM
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Vhf.
Old 05-27-2020, 12:09 PM
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Originally Posted by barrell View Post
could you be more specific? Does it perform as well as 8 footer?
Mr. Hebert can, maybe more than you want to know:

Continuous Wave
Old 05-27-2020, 12:20 PM
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Sooner or later, height makes a difference, since VHF is line of sight. What exactly is your beef with your current antenna? A lot of VHF issues are due to cabling, connectors, and the radio itself.
You can get ratchet type fold-down antenna mounts to cope with bridges. I'd suspect that the TowBoatUS boat pictured is for in-shore use.
Old 05-27-2020, 04:05 PM
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I think it is a 2 meter radio antenna. Found this pic on the Internet
Old 05-27-2020, 05:24 PM
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Originally Posted by Aquasport 250 View Post
I think it is a 2 meter radio antenna. Found this pic on the Internet
that’s it thanks
Old 05-27-2020, 07:14 PM
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Metz, probably installed 300 or more in commercial VHF, UHF and Marine VHF.
Base loading coil gave I think 3db gain?
Could really tune it by clipping the SS wire while checking SWR.
could also get just the whip wire if you clipped too much............
I want to say the fiberglass rod type are 6db gain?
Been awhile so could be off on the gain numbers.
Oh, they made a FM radio version also
Old 05-27-2020, 07:36 PM
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thinking out loud but could he have some kind of repeater that repeats to vhf so he doesn't need a tall antennae?
Old 05-29-2020, 07:47 AM
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I read on the mertz website that is the antennae used on all coast guard RIBs It must be pretty good if every coast guard boat is using them instead of a 8 foot shakespeare.
Old 05-29-2020, 08:14 AM
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Originally Posted by barrell View Post
I read on the mertz website that is the antennae used on all coast guard RIBs It must be pretty good if every coast guard boat is using them instead of a 8 foot shakespeare.
Not every CG boat, just RIBS.
Old 05-29-2020, 08:21 AM
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Originally Posted by barrell View Post
I read on the mertz website that is the antennae used on all coast guard RIBs It must be pretty good if every coast guard boat is using them instead of a 8 foot shakespeare.
When you get down to it, VHF antennas are all pretty simple. It is a bit of the unshielded center conductor, cut to a specific length to correlate to the center frequency of the RF band you want to send/receive. For the most part, when talking about the frequencies and power levels of marine VHF, all the options for a given length are pretty much the same, and will perform similarly overall. What makes or breaks VHF range and capabilities are installation height, and quality of the installation (cable type/rating, terminations, connectors, etc).

Buy a VSWR meter, minimize splices and couplings, ensure your VHF has a solid connection to the DC bus, and mount your antenna as high as possible.
Old 05-29-2020, 08:34 AM
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I'm surprised your 4ft Digital doesn't do well. Mine is great.
Old 05-29-2020, 08:50 AM
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Originally Posted by fishypete View Post
I'm surprised your 4ft Digital doesn't do well. Mine is great.
Yesterday I talked to a guy crystal clear 6 miles away. Thats about as far as I usually get crystal clear reception. Of course Ive talked to coast guard from 20 miles but they have special equipment.
Old 05-29-2020, 09:29 AM
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One morning we were 40 miles west of Cedar Key Florida. Cheapo $99 VHF radio, and 8' fiberglass antenna mounted on T-top. Called SeaTow for a radio check. They answered, but I could tell it was not the normal SeaTow from New Port Richey that we usually hear. Turned out they were on the coast of South Carolina. They couldn't believe it and neither could we. Not exactly loud and clear, but good enough to converse. Something like 300 miles away, or more. Clear day and calm seas.
Old 05-29-2020, 10:21 AM
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Originally Posted by Capt Odyssea View Post
Metz, probably installed 300 or more in commercial VHF, UHF and Marine VHF.
Base loading coil gave I think 3db gain?
Could really tune it by clipping the SS wire while checking SWR.
could also get just the whip wire if you clipped too much............
I want to say the fiberglass rod type are 6db gain?
Been awhile so could be off on the gain numbers.
Oh, they made a FM radio version also
Base loading coils do not provide gain. They simply provide a better match (lower SWR) at the freq of operation, but that antenna literally has unity gain; e.g. no gain. It's not as effective as a quarter wave element, but it is effective enough to get the job done, for communications with base stations and to repeaters.

Last edited by CaptWill; 05-29-2020 at 11:01 AM.
Old 05-29-2020, 10:35 AM
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That is called 'skip'...happens on two meters sometimes when the sunspots/propagation is just right and the RF signals 'bounce' off the ionosphere...and back..... not very frequent on two meters....but happens sometimes. More prevalent in the other amateur bands of the spectrum.
Old 05-29-2020, 10:54 AM
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Originally Posted by barrell View Post
Yesterday I talked to a guy crystal clear 6 miles away. Thats about as far as I usually get crystal clear reception. Of course Ive talked to coast guard from 20 miles but they have special equipment.
Interesting. I was talking to a buddy at Shark river and I was up at the hook last weekend. Easy ten plus miles.

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