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Old 05-25-2014, 05:57 PM   #1
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Antenna for XM radio

I am installing a new dash radio with satellite radio. The dealer said to mount the antenna on a metal surface or at least a metal plate preferably on the roof to improve the reception? I was wondering if I just place the antenna on the dash board and not on any metal plate. Would it receive a signal through the wind shield? A GPS works on the dash why wont the radio?
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Old 05-25-2014, 06:04 PM   #2
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My factory installed antenna failed. I put a new one in and put it in the cabinet above the drivers seat. Np problems.
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Old 05-25-2014, 06:19 PM   #3
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My factory installed antenna failed. I put a new one in and put it in the cabinet above the drivers seat. Np problems.
You put it in the cabinet? Now I am really lost How does it get it's signal?
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Old 05-25-2014, 06:32 PM   #4
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Mine is in the upper cabinet above the sattelite receiver. Signal goes right thru the roof anywhere in the coach. Rkl
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Old 05-25-2014, 08:42 PM   #5
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Well that sounds easy. Thanks "toneumanns and RKL" I'll give it a try.
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Old 06-04-2014, 12:01 AM   #6
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I mounted one by sticking it to the inside of the (class A) crown (fiberglass) just above windshield on passenger side. Ran antenna cable behind windshield post trim. No metal anywhere near it... Works great..
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Old 06-04-2014, 08:16 AM   #7
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Quote:
Originally Posted by fountain42 View Post
I am installing a new dash radio with satellite radio. The dealer said to mount the antenna on a metal surface or at least a metal plate preferably on the roof to improve the reception? I was wondering if I just place the antenna on the dash board and not on any metal plate. Would it receive a signal through the wind shield? A GPS works on the dash why wont the radio?
Technically speaking, the XM antennas designed for use on autos are designed to have a ground plane mounting surface. (ferrous metal roof). While they will usually work on a non-metallic surface, the performance can be affected. Since most RV roofs are not made of ferrous metal, a marine antenna design will work better, since the ground plane is designed into the antenna itself.

In wide open spaces you probably will not notice the difference, when the signal starts to get interference (heavy clouds, light tree cover etc.) the marine style antenna will start to out perform when mounted on a fiberglass roof.
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Old 06-04-2014, 08:23 AM   #8
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In wide open spaces you probably will not notice the difference, when the signal starts to get interference (heavy clouds, light tree cover etc.) the marine style antenna will start to out perform when mounted on a fiberglass roof.
I agree. I started off with the stock magnetic antenna velcro'ed inside the front cap but kept getting signal dropouts. I then drilled the roof and mounted a marine antenna outside. No more dropouts.
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