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Old 06-02-2003, 04:25 PM   #1
johnmish
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Default Installation in Boat

As most boat owners can testify to, radio reception on the water is awful. Satellite radio on a boat sounds like the perfect answer. But, my boat is made of fiberglass and has no large, flat, metal area to mount the antenna. The largest flat area that I have, is an 18" x 6' fiberglass swim platform at the back (see this picture). I may be able to fit a small metal plate underneath but I'm not sure that it will be enough.

Can anyone offer any suggestions about installing in a boat - if it's even possible?
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Old 06-02-2003, 04:31 PM   #2
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How many feet is your boat?

Does it have a stainless rail around the sides? You may want to get a truck or marine antenna to mount upright if a Terk car antenna won't work.

Although not ideal, an XM marine antenna will receive Sirius as well.

Sirius RV/Truck Antenna
http://www.crutchfield.com/cgi-bin/S...0&I=209SIR4CL+

XM Marine Antenna
http://shop.store.yahoo.com/xmfanstore/texm5maan.html

Jeff
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Old 06-02-2003, 04:35 PM   #3
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Sirius sells a marine antenna made by Galaxy.
But I cant remember who sells the darn thing..

http://www.sirius.com/servlet/Conten...=1033762798909

But, the XM antenna would work...
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Old 06-02-2003, 04:42 PM   #4
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The Galaxy antenna is huge. It would be alright for a yacht, but I'd definitely go with the XM marine antenna for a smaller pleasure boat.

Jeff
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Old 06-02-2003, 04:58 PM   #5
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Here's a link to the Galaxy marine antenna. You can find it at West Marine.

http://www.shakespeare-marine.com/an...a-10-specs.htm

Jeff
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Old 06-03-2003, 03:54 PM   #6
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For starters I want to thank you guys for the quick suggestions.

My boat is only 18 feet so the Galaxy does not make too much sense for me. And, I really like the look of the Terk XM5 better. But, both Crutchfield and Terk have suggested that I not use the XM antenna with a Sirius system. The Terk guy said something about them operating on different frequencies. Jeff, you said "Although not ideal, an XM marine antenna will receive Sirius as well.". Can you tell me what the drawbacks are with using it or what problems I might have?

Thanks again for the help!

PS The Terk guy suggested that I use the SIR4-CLIP antenna which is made for trucks and RV.s. The funny thing is that it looks exactly like the XM4-CLIP with a different logo. Could it be the exact same guts inside of it?
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Old 06-03-2003, 04:34 PM   #7
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The XM marine antenna will pick up Sirius frequencies as well. Normally it is not a good idea to use an XM antenna with a Sirius tuner, but this is really only a concern for mobile car applications because of the different look angles. But since you are over open water I think it will work great.

Jeff
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Old 06-03-2003, 04:36 PM   #8
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I thought that XM and Sirius antennas recieved the same frequencies, but the XM antenna is optimized for a lower (<45 degree) elevation signal and the Sirius more of a higher (>45 degree) elevation. Thus the "guts" would just be at different attitudes relative to the horizon. Maybe this would be acceptable on an 18-footer, which will probably spend more time pitching and rolling than something on level ground Just a thought.
-eric
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Old 06-03-2003, 04:49 PM   #9
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XM and Sirius do operate on different frequencies, however they are right next to each other. So, the antenna will still receive them the same. However, as you said, the antenna have different gain patterns on the antenna for each service. One is optimized for a lower elevation satellite signal, the other is reversed. But just as Jeff said, thats really only a major concern for autos, not boats.
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Old 06-03-2003, 05:21 PM   #10
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Even though Sirius recommends the antenna be mounted in a 2x2 metal surface, I have never heard of any reception trouble if you didn't. At my store we do ALOT of Rig installs (way before there were the new staff antennas) and the only thing to mount them on is fiberglass. We have even has customers mount them inside the cab without any loss of reception. The whole roof of the cabs are fiberglass so the signal goes right through.
With that said, don't spend alot of money on a Marine antenna when a regular Terk SR20S for $50 will work just fine.
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Old 06-03-2003, 05:29 PM   #11
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Quote:
Originally Posted by Anonymous
With that said, don't spend alot of money on a Marine antenna when a regular Terk SR20S for $50 will work just fine.
For $50 more you get the clean looking weatherproof version. I'm sure it would also be easier to mount in a marine environment rather than the adhesive Terk.

Jeff
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Old 06-04-2003, 03:23 PM   #12
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I just intstall Sirius on my 18ft. Boat. I installed the antenna (Terk Auto) right before the swim paltform. I had enough room to mount it on a flat piece and then run the wires down into the engine compartment and them to the the receiver. So far, I haven't had any trouble with the mounting location.
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Old 08-03-2003, 01:57 PM   #13
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Shakespeare has also released a smaller version, the SRA-30. The SRA-10 looks big, but its not that much bigger than a GPS antenna.

You can check out the SRA-30 specs here - http://www.shakespeare-marine.com/an...axy/sra-30.asp

You can also see a pic of the SRA-10 installed right next to a Garmin 2010C and a Raytheon Raynav300 antenna here - http://www.quiros.net/searay/sirius/...SIRIUSANT2.JPG. This will give you a sense of how much bigger it is.

Sam
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