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Old 05-11-2007, 08:19 PM   #1
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Default Stereo Antenna

I am installing a stereo on my boat and I want to mount the stereo antenna next to the VHF antenna. Will this cause interference with either one
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Old 05-11-2007, 09:27 PM   #2
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Default Re: Stereo Antenna

I would have to say that the answer is a definite maybe. :grin

You should be ok because the freq separation between VHF and FM is enough that the FM tuner should be able to reject the VHF signal. However, transmitting radios can generate spurious signals that could "overload" your FM receiver causing it to loose your FM radio reception while transmitting on VHF. I would temporarily place your FM antenna to test before bolting it down. If there is a problem, you probably won't have to move it much to make things work (ie - inches instead of feet).

FWIW, I have a 2m VHF ham radio in my truck. The antenna has a gain similar to that of a marine VHF antenna that is mounted on the opposite side of the hood from my fm antenna. The 2m amateur radio is much closer to FM broadcast than VHF and I can broadcast 50 watts without causing my FM radio to loose it's signal. Without better experience, I would have to say that a foot or 2 between antennas would be enough to keep things working but I would test before screwing things down
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Old 05-12-2007, 12:42 AM   #3
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Default Re: Stereo Antenna

I have 3' between two 8' antennas, and I loose a weak FM signal when transmitting. But, it's not a big deal. Doesn't seem to hurt the stereo.

Mike
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Old 05-12-2007, 06:10 PM   #4
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Default Re: Stereo Antenna

I was hoping to put them both side by side.
This way the antenna wire will not be exposed.


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Old 05-12-2007, 06:59 PM   #5
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Default RE: Stereo Antenna

What about this:

http://www.westmarine.com/webapp/wcs...10001/722/29/3
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Old 05-12-2007, 07:20 PM   #6
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Default Re: Stereo Antenna

About the splitter...read the reviews on their web site. Some people like it, some do not. Mike
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Old 05-12-2007, 07:21 PM   #7
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Default Re: Stereo Antenna

I just bought the seperator for my soon to be new boat . Wanted as few items sticking up as possible on the CC. I have been told that this item does work well.
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Old 05-12-2007, 07:32 PM   #8
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Default RE: Stereo Antenna

Does the seperator just not improve reception over a normal antenna or does it make it worse then a normal FM/AM antenna? I am going to be installing a VHF and a AM/FM CD player and I was going to go with this just because I want 1 antenna and not 2.
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Old 05-12-2007, 10:10 PM   #9
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Default Re: Stereo Antenna

The splitters work fine. An 8 foot boat antenna works great as a receive antenna for the FM band. As for the AM band, longer is better. But who wants to listen to ancient modulation while boating? It is just that talk stuff down there anyway.

The splitter will allow you to listen to the madness on channel 16 and your favorite FM music station at the same time. When you transmit, the FM signal will go away.

But this is the 21st century! So what I do is place a Sirius satellite radio tuner right next to the boat FM radio. The tuner has a built in low power FM transmitter. Without any antenna plugged into the radio I get a nice clear solid signal - and no commercials
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