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Author Topic: VHF Antenna Suggestions?  (Read 4153 times)

January 23, 2011, 01:43:08 PM
Reply #15

GoneFission

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Re: VHF Antenna Suggestions?
« Reply #15 on: January 23, 2011, 01:43:08 PM »
I used an 8 footer on mine with the bimini before I got the t-top.  I think the difference between a 3 foot an 8 foot is enough to warrant the longer antenna.  I had the antenna mounted on the side of the console toward the front, so it came up just in front of the bimini.  One thing to consider - get those bimini slide tracks that let you move your bimini back and forth and you can adjust the bimini much better, both when it's up and and when folded down.  I could slide the bimini back enough to get rods and the radio antenna ahead of it, or slide it up if I did not have rods in the console rod holders.  The slide tracks also allowed me to push the bimini back when folded down so it was out of the way, or I could slide it up and fold it forward over the coffin if I did not want he folded bimini around the stern/transom area.  Here are some pics to give you the idea:



Cap'n John
1980 22-2 CCP
Mercury 200 Optimax 
ASPA0345M80I
"Gone Fission"
ClassicAquasport Member #209


January 23, 2011, 05:40:45 PM
Reply #16

MarshMarlowe196

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Re: VHF Antenna Suggestions?
« Reply #16 on: January 23, 2011, 05:40:45 PM »
Quote from: "John Jones"
It received just fine with the antenna down but I would not transmit unless it was up.  I had a bimini and it just pushed the antenna forward a little when up.

Higher gain does concentrate the radiation pattern for slightly more range but the tighter radiation pattern makes the radio fade in and out when the boat rolls.  Think of a donut laying on the ground and that's what the radiation pattern looks like from a vertically polarized antenna.  Now mash the donut flat.  Yes it spreads out in area covered but now the vertical coverage is concentrated in a flatter pattern.  Tilt it a little like the boat rolling and you overshoot or undershoot your target.  Like everything else one has to pick the least of the evils for their own purpose.  (antennas and radio communications were my first career choice many moons ago)

I bought that KW new in '02 and sold it a couple of years later with 300 hours on it.  It had some quality problems that really irritated me and I got rid of it before they turned into major issues.  The main issue was that after the maiden voyage it had water in the hull and transom core.  When I drilled holes to install a transom mount transducer water drained from the holes then dripped for 3 days after one trip on the water.  I finally figured out that the drain plug fitting was installed at the factory with no sealant and the bilge pump was kicking on every 5 minutes on the first trip.  The battery tray, bilge pump, and live well pumps were screwed to the inner hull with no sealant and some of the screws were over torqued and stripped out the fiberglass.  All of that allowed water in the core.  I could not get the KW factory to return my calls.   :x   The way the dash is made spray and rain runs in behind the smoked Plexiglas panel onto the backside of all the switches and gauges.  If I had ever named the boat it would have been "Hard and Wet" because that's how it rode.

Yeah- I've read how the gain affects the transmission.  I'm leaning toward a 3db for that reason.  I'm not ever talking to anybody Further than about 15 miles from me, and in an emergency I'll be able to communicate with the coast guard with any antenna.

I'm sorry to hear about your poor experience with the KW.  From what I've read over on THT, that's not typical of the brand, but "your experience may vary".  My dad actuallys works in warranty sometimes, but he's only been with the company since 05'.  The reason why I asked if you still had the 1900 was because I didn't want to trash that boat if you still had it  :) That hull design was and is terrible.  I've never been a fan of that model, but for some reason they keep selling them.  If you read the description on the website (written by my dad), he shares the same sentiments.  Good Riddance if anything else.

Quote from: "Tom Marlowe"
The oldest boat in our line up, the 1900CC just keeps going. Maybe it's the wide open floor space, or the fact that it runs well on only 115hp, or maybe because it is so versatile; who knows, but for over twenty years it's made boaters happy all over the country, so we'll keep building them as long as you like.

http://www.keywestboatsinc.com/boats/show/id/17


Quote from: "GoneFission"
I used an 8 footer on mine with the bimini before I got the t-top. I think the difference between a 3 foot an 8 foot is enough to warrant the longer antenna. I had the antenna mounted on the side of the console toward the front, so it came up just in front of the bimini. One thing to consider - get those bimini slide tracks that let you move your bimini back and forth and you can adjust the bimini much better, both when it's up and and when folded down. I could slide the bimini back enough to get rods and the radio antenna ahead of it, or slide it up if I did not have rods in the console rod holders. The slide tracks also allowed me to push the bimini back when folded down so it was out of the way, or I could slide it up and fold it forward over the coffin if I did not want he folded bimini around the stern/transom area. Here are some pics to give you the idea:





That's looks like it would work well, but my bimini goes much further forward than yours.  I'm guessing John's (JJ's) was set up like yours and that's why it didn't interfere with the grabrail mounted antenna. Either my top is big, or it's just far forward.  It covers about a foot behind my cooler seat (behind the console) to about a foot in front of my console, and it really works well... which is why I'm battling the idea of a T-Top.  

So I'm thinking I'm gonna try the bimini bracket mount or stick with the console mount, but either way it's going to be a 3' Antenna.  I just need some suggestions on a good one.

Thanks Guys  :salut:
Key West 1720 / Yam C90

Sold: 1973 Aquasport 19-6

January 23, 2011, 08:14:44 PM
Reply #17

seabob4

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Re: VHF Antenna Suggestions?
« Reply #17 on: January 23, 2011, 08:14:44 PM »
Jess,
If you're gonna stick with the 3 footer, the Shakespeare "Squatty Body" is probably as good as you're gonna get...


Corner of 520 and A1A...

January 25, 2011, 03:56:45 PM
Reply #18

Skoot

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Re: VHF Antenna Suggestions?
« Reply #18 on: January 25, 2011, 03:56:45 PM »
Quote from: "gran398"
In 1995, bought a G3 14' aluminum doublewide jon. (G3's first year in business). In 1998, fitted it with a flush-mount Uniden M45 waterproof VHF, Shakespeare 6b gain 3' base-loaded antenna.
Scott I cant find this antenna anywhere, Can you point me in the right direction?  The only one I can find has a 3db gain.

Thanks
Scott

1975 19-6 - 90hp Tohatsu

January 25, 2011, 04:21:56 PM
Reply #19

gran398

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Re: VHF Antenna Suggestions?
« Reply #19 on: January 25, 2011, 04:21:56 PM »
Scott, I was mistaken on the 6db gain...after cking the specs online it is a 3bd gain. Poor memory, my bad. Sorry to send you on a wild goose chase.

However, the part about its ability to talk to the CG 50+ miles away is not a mistake. Don't know why, but pretty amazing. I think you will be real happy with the Shakespeare.


http://www.boatersland.com/sha5241r.html

January 25, 2011, 07:15:47 PM
Reply #20

RickK

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Re: VHF Antenna Suggestions?
« Reply #20 on: January 25, 2011, 07:15:47 PM »
3dB is doubling the output power though.
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

January 25, 2011, 08:02:58 PM
Reply #21

John Jones

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Re: VHF Antenna Suggestions?
« Reply #21 on: January 25, 2011, 08:02:58 PM »
If you really want versatility this is the shorty I have now and the whip will fold 90 degrees.


http://www.saltysmarine.com/index.php?m ... ucts_id=85





Politics have no relation to morals.
Niccolo Machiavelli

January 25, 2011, 08:09:51 PM
Reply #22

John Jones

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Re: VHF Antenna Suggestions?
« Reply #22 on: January 25, 2011, 08:09:51 PM »
Quote from: "RickK"
3dB is doubling the output power though.

It's all marketing, especially at the 3db level.  What that means it that it has effectively twice the signal strength as a baseline dipole antenna which is this.

Politics have no relation to morals.
Niccolo Machiavelli

January 25, 2011, 08:32:33 PM
Reply #23

GoneFission

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Re: VHF Antenna Suggestions?
« Reply #23 on: January 25, 2011, 08:32:33 PM »
Quote from: "MarshMarlowe196"
That's looks like it would work well, but my bimini goes much further forward than yours.  I'm guessing John's (JJ's) was set up like yours and that's why it didn't interfere with the grabrail mounted antenna. Either my top is big, or it's just far forward.  It covers about a foot behind my cooler seat (behind the console) to about a foot in front of my console, and it really works well... which is why I'm battling the idea of a T-Top.  
Thanks Guys  :salut:

If you do the bimini sliders, you can slide the top back 2 feet or so when you want to.  Or fold the antenna down and move up up for forward shade - not bad for $35:

http://www.westmarine.com/webapp/wcs/st ... sNum=10840
Cap'n John
1980 22-2 CCP
Mercury 200 Optimax 
ASPA0345M80I
"Gone Fission"
ClassicAquasport Member #209


January 26, 2011, 10:44:37 AM
Reply #24

MarshMarlowe196

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Re: VHF Antenna Suggestions?
« Reply #24 on: January 26, 2011, 10:44:37 AM »
Quote from: "GoneFission"
Quote from: "MarshMarlowe196"
That's looks like it would work well, but my bimini goes much further forward than yours.  I'm guessing John's (JJ's) was set up like yours and that's why it didn't interfere with the grabrail mounted antenna. Either my top is big, or it's just far forward.  It covers about a foot behind my cooler seat (behind the console) to about a foot in front of my console, and it really works well... which is why I'm battling the idea of a T-Top.  
Thanks Guys  :salut:

If you do the bimini sliders, you can slide the top back 2 feet or so when you want to.  Or fold the antenna down and move up up for forward shade - not bad for $35:

http://www.westmarine.com/webapp/wcs/st ... sNum=10840

Sounds good... but, when I want to move the top forward, I'll then have 8' of Antenna laying in the floor, or if not in the floor, generally just in the way.  Then I'll have to buy a new antenna when I step on it / walk into it.  So, I could leave it up and have the top slid back at all times, but at that point, I might as well just mount the top further back, which kind of defeats the purpose of the sliders.  I already can't trim the motor up when it's laying on the gunwale, so further back is not really appealing.  Good idea though- I honestly think your boat being 2' longer, w/ your console further forward because of the splashwell makes your setup work well.  I like having the entire console and cooler seat under the top- just makes sense to me and I'm sure my passengers appreciate it too.  Looks like it's going to be a 3' antenna.


Quote from: "John Jones"
If you really want versatility this is the shorty I have now and the whip will fold 90 degrees.


http://www.saltysmarine.com/index.php?m ... ucts_id=85






Looks like a winner.  Thanks a lot guys  :salut:
Key West 1720 / Yam C90

Sold: 1973 Aquasport 19-6

January 26, 2011, 11:45:05 AM
Reply #25

DOCREED

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Re: VHF Antenna Suggestions?
« Reply #25 on: January 26, 2011, 11:45:05 AM »
shakespear 5225XT  is an 8' antenna, 6dB gain

I have been in this business for over 20 years and i recommend this antenna without reservation.

You are better off with a cheap radio and a good antenna than a great radio and a crappy antenna.
89 250 CCP
full transom
Twin Merc 150\'s......thirsty?  YES they are.


January 26, 2011, 07:57:29 PM
Reply #26

RickK

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Re: VHF Antenna Suggestions?
« Reply #26 on: January 26, 2011, 07:57:29 PM »
6dB = double, double power.  Now you're starting to cook.
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

January 26, 2011, 10:46:31 PM
Reply #27

gran398

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Re: VHF Antenna Suggestions?
« Reply #27 on: January 26, 2011, 10:46:31 PM »
Quote from: "DOCREED"
shakespear 5225XT  is an 8' antenna, 6dB gain

I have been in this business for over 20 years and i recommend this antenna without reservation.

You are better off with a cheap radio and a good antenna than a great radio and a crappy antenna.




DOCREED you're right, that's a fine unit. Have always run Shakespeare's on my junk.

January 26, 2011, 10:55:19 PM
Reply #28

John Jones

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Re: VHF Antenna Suggestions?
« Reply #28 on: January 26, 2011, 10:55:19 PM »
If you are going to go big, go all the way.  10db

http://www.digitalantenna.com/prods/vhfantenna_16.html
Politics have no relation to morals.
Niccolo Machiavelli

January 27, 2011, 12:09:08 AM
Reply #29

Circle Hooked

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Re: VHF Antenna Suggestions?
« Reply #29 on: January 27, 2011, 12:09:08 AM »
As they say bigger is better,not sure what kind of boating you do but think of this,say your offshore and it gets nasty,like 6foot swells,it happens,well when you're talking line of sight a short antenna might not poke out over that wave when you're in the trough where that extra 5 ft of antenna would,i have always been a fan of the best you can afford and as high as you can get it with antenna's,it is a life saving tool after all,just my thoughts. :salut:
Scott
1997 225 Explorer

 


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