Notices
Marine Electronics Forum

3ft to 4ft VHF Antenna

Old 03-26-2003, 04:16 PM
  #1  
Member
Thread Starter
 
Join Date: Mar 2003
Location: Virginia Beach, Virginia
Posts: 45
Likes: 0
Received 0 Likes on 0 Posts
Default 3ft to 4ft VHF Antenna

Does anyone know of a manufacturer of a 6db 3ft to 4ft VHF antenna?

Best I have found is a 4ft 4.5db Digital.

Thanks.
VBmaycraft is offline  
Old 03-26-2003, 04:40 PM
  #2  
Admirals ClubCaptains Club Member Admiral's Club Member
THT sponsor
 
Join Date: May 2002
Location: Brookhaven, LI, NY
Posts: 15,770
Likes: 0
Received 27 Likes on 19 Posts
Default 3ft to 4ft VHF Antenna

The Digital 528V is 4' with 4.5 db. That is the best you will get. And, it is probably the best made antenna out there.

You can get it at Consumers:
http://www.consumersmarine.com/produ...at=90&menu=com

Birdman, Capt of
Birdman is offline  
Old 03-27-2003, 04:03 AM
  #3  
Senior Member
 
Join Date: Oct 2002
Location: Stockbridge, ga
Posts: 373
Likes: 0
Received 0 Likes on 0 Posts
Default 3ft to 4ft VHF Antenna

I have a three foot, 6db gain antenna. Have it mounted to the top of the t-top. It is light and folds down easily for transporting. The antenna itself is 3/8 solid aluminum.

old fishermen never die, they just smell that way
ovenman is offline  
Old 03-27-2003, 05:41 AM
  #4  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: May 2002
Location: Skaneateles, New York
Posts: 5,483
Likes: 0
Received 2 Likes on 2 Posts
Default 3ft to 4ft VHF Antenna

Ovenman...give us a little more detail on that 3', 6db aluminum antenna. Manufacturer, cost, website,...your experience with performance, etc. As to the first question; why not go to 8'? Someday you'll need that extra range.

Boston Whaler, "MUMBLER", 24' Outrage (1996), twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
Mumblerone is offline  
Old 03-27-2003, 06:05 AM
  #5  
Member
Thread Starter
 
Join Date: Mar 2003
Location: Virginia Beach, Virginia
Posts: 45
Likes: 0
Received 0 Likes on 0 Posts
Default 3ft to 4ft VHF Antenna

Ovenman,

Can you tell me the make and model of that antenna? Also, where might you get one - Internet, Store, etc.

Your input is much appreciated.
VBmaycraft is offline  
Old 03-27-2003, 06:21 AM
  #6  
Senior MemberCaptains Club Member
 
Join Date: Feb 2001
Location: West Virginia
Posts: 3,877
Likes: 0
Received 2 Likes on 2 Posts
Default 3ft to 4ft VHF Antenna

I don't want to burst anyone bubble here but it is not possible to have a solid metal antenna that's 3' long operating around 156 MHz that would be 6 dB.

Thom

Thom is offline  
Old 03-27-2003, 06:30 AM
  #7  
Senior MemberCaptains Club Member
 
Join Date: Mar 2001
Location: NJ
Posts: 1,035
Received 4 Likes on 4 Posts
Default 3ft to 4ft VHF Antenna

GAM makes a 3' 6db 156.8MHz whip antenna.

http://www.gamelectronicsinc.com/mini.html

joe
dowop is offline  
Old 03-27-2003, 06:43 AM
  #8  
Senior MemberCaptains Club Member
 
Join Date: Feb 2002
Location: Grady 247 Advance
Posts: 548
Likes: 0
Received 0 Likes on 0 Posts
Default 3ft to 4ft VHF Antenna

Here's a Gam Electronics SS-2 installed on a T-top. It's a little hard to see on this pic because it's a thin SS whip, but on the starboard side you're looking at a SS ratchet mount, a GAM white plastic adapter/cable, and the SS antenna.

The adapter/cable for this antenna runs about $20 and there's two styles (#2 and #3 on this page):

http://www.gamelectronicsinc.com/adapters.html

Fuzzy

fuzzy2u is offline  
Old 03-27-2003, 06:45 AM
  #9  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: May 2002
Location: Skaneateles, New York
Posts: 5,483
Likes: 0
Received 2 Likes on 2 Posts
Default 3ft to 4ft VHF Antenna

Can't beat height! I use to have a 6" plus or minus emergency antenna for my Icom 125...near wothless! They are sold as such and come in a plastic tube. I tried it several times and thru it away.

Boston Whaler, "MUMBLER", 24' Outrage (1996), twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
Mumblerone is offline  
Old 03-27-2003, 08:30 AM
  #10  
Senior MemberCaptains Club Member
 
Join Date: Mar 2001
Location: NJ
Posts: 1,035
Received 4 Likes on 4 Posts
Default 3ft to 4ft VHF Antenna

If mounting on a top or arch and wanted a 6db antenna, I would personally take the 3 or 4' versus the 8'. I completely understand the line-of-site issue, but in rough seas the flatter radiation pattern of the 6db can actually be worse.
dowop is offline  
Old 03-27-2003, 09:07 AM
  #11  
Member
Thread Starter
 
Join Date: Mar 2003
Location: Virginia Beach, Virginia
Posts: 45
Likes: 0
Received 0 Likes on 0 Posts
Default 3ft to 4ft VHF Antenna

Thanks for the input. I am going to look into GAM electronics.

The antenna will be going on top of a T-Top, which will give it some height, and it will not be as whippy. In this situation, it is not line of sight. The VHF frequency strength is due more to saturation and decible strenghth.

I believe the 3' to 4' 6db on top of a t-top will work great.

Again, thanks for the input. Other comments are still read and appreciated.
VBmaycraft is offline  
Old 03-27-2003, 09:12 AM
  #12  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: May 2002
Location: Skaneateles, New York
Posts: 5,483
Likes: 0
Received 2 Likes on 2 Posts
Default 3ft to 4ft VHF Antenna

dowop...the 3' low db anntennas were designed for sailboats primarilly, most of the time the sail boats are heeled over. Most of the time the pattern on a 6-9db anntenna would be in the water...this I understand. It is also my opinion, from experience, that in rough weather the antenna is mostly up. I have never had a problem comunicating when seas were high. Have you? I do believe, that one day I'll need the extra range a high antenna affords. It may not even be rough when that day comes! Anything less that, the maximum height you can get on your boat; you do at you're own peril.

Boston Whaler, "MUMBLER", 24' Outrage (1996), twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
Mumblerone is offline  
Old 03-27-2003, 09:32 AM
  #13  
Admirals ClubCaptains Club Member Admiral's Club Member
THT sponsor
 
Join Date: May 2002
Location: Brookhaven, LI, NY
Posts: 15,770
Likes: 0
Received 27 Likes on 19 Posts
Default 3ft to 4ft VHF Antenna

I know nothing about Gam electronics, have never herd of them. But can tell you this. After doign the math, you will find, it is impossible to have a base loaded 3' stainless antenna tuned for 155-160 Mhtz, have a db gain of 6.

Enjoy!!

Birdman, Capt of
Birdman is offline  
Old 03-27-2003, 09:54 AM
  #14  
Senior MemberCaptains Club Member
 
Join Date: Feb 2002
Location: Grady 247 Advance
Posts: 548
Likes: 0
Received 0 Likes on 0 Posts
Default 3ft to 4ft VHF Antenna

quote:Originally posted by Birdman:
After doing the math, you will find, it is impossible to have a base loaded 3' stainless antenna tuned for 155-160 Mhtz, have a db gain of 6.

OK, I'll bite.

Want to try to explain this to those of us who are mathematically and electronically clueless?

Fuzzy
fuzzy2u is offline  
Old 03-27-2003, 10:00 AM
  #15  
Senior Member
 
Join Date: Oct 2001
Location: Nantucket, Ma
Posts: 214
Likes: 0
Received 0 Likes on 0 Posts
Default 3ft to 4ft VHF Antenna

Read the review on the Gam site, done by Practical Sailor. They are the same outfit as Powerboat Reports, that conducts supposedly unbiased reviews. They don't sell any advertising space so they have no stake. They gave the 3 foot Gam a top rating, saying it performed to the 6db rating, and was their top choice for masthead mounting or smaller boats. It got better ratings than the Digital antennas tested. Sounds like good equipment to me !
Eric S is offline  
Old 03-27-2003, 10:10 AM
  #16  
Admirals ClubCaptains Club Member Admiral's Club Member
THT sponsor
 
Join Date: May 2002
Location: Brookhaven, LI, NY
Posts: 15,770
Likes: 0
Received 27 Likes on 19 Posts
Default 3ft to 4ft VHF Antenna

Here's one way: (Cut from a website)

G =27,000 / (BWh x BWv)
where G is the power gain of the antenna, BWh is the horizontal beamwidth of the antenna and BWv is the vertical beamwidth of the antenna. As an example, consider an antenna that had a vertical beam width of 27 degrees and a horizontal beam width of 10 degrees; it will have a power gain of 100 or 20 db. This would also have a vertical dimension of about 2 wavelengths and a horizontal dimension of about 5 wavelengths if the antenna is uniformly excited.



Birdman, Capt of
Birdman is offline  
Old 03-27-2003, 10:36 AM
  #17  
Senior MemberCaptains Club Member
 
Join Date: Feb 2002
Location: Grady 247 Advance
Posts: 548
Likes: 0
Received 0 Likes on 0 Posts
Default 3ft to 4ft VHF Antenna

I don't get it.
fuzzy2u is offline  
Old 03-27-2003, 11:08 AM
  #18  
Senior MemberCaptains Club Member
 
Join Date: Jan 2003
Location: Lewes, DE
Posts: 4,924
Likes: 0
Received 3 Likes on 3 Posts
Default 3ft to 4ft VHF Antenna

quote: I don't get it.

I'm with you fuzzy. I don't get it either.

Birdy - I'm a computer geek, radio isn't my bag...

I'll give you an example of my situation.

I have a 17' center console that does not have a t-top (yet). I'm mounting an iCom 402 VHF with a console-railing mounted nylon ratchet and Shakespeare 36", 3db, low profile VHF antenna.

I picked the antenna and mount combo so when trailering, I could flip the antenna 180 degrees over and be able to drop my console cover on top without having to worry about the antenna being damaged.

I looked at all the other options... the 8' and 4' fiberglass antennas, but everything was too heavy to have swinging back and forth on that console grab rail. I decided against a gunwale mount for obvious reasons.

Without a t-top, that left me with minimal mounting options. Will my antenna reach out and touch the offshore boys? Nope, but it'll do me well for the areas I intend to fish in the Chesapeake Bay, and that's OK with me.

If someone has a better solution for a small center console like mine, I'm open to suggestions.
Megabyte is offline  
Old 03-27-2003, 11:58 AM
  #19  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: Feb 2003
Location: Thornton's Ferry,NH,USA
Posts: 10,751
Likes: 0
Received 80 Likes on 46 Posts
Default 3ft to 4ft VHF Antenna

They cost about $20 and you can probably mount it to the top of your grab-rail.

I use one to hold a 3ft steel to my bimini. From Center Harbor NH (Lake Winnipissaukee) I can hear the USCG Gray ME about 60 mi and over some small mountains.

I'm sure this is due more to the quality of their antenna than mine but it's a good example of what you can expect if you need to call your local USCG base since they all use the same gear.
Kamper is offline  
Old 03-27-2003, 12:30 PM
  #20  
Admirals ClubCaptains Club Member Admiral's Club Member
THT sponsor
 
Join Date: May 2002
Location: Brookhaven, LI, NY
Posts: 15,770
Likes: 0
Received 27 Likes on 19 Posts
Default 3ft to 4ft VHF Antenna

The point was, if you plug in VHF antenna lengths... into the equation, you can't come out with 6 db on a 3' lenght.

Birdman, Capt of
Birdman is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.