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Old 07-20-2009, 05:32 PM   #1
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Sirius Antenna on Roll Bar Cuts Out Frequently, Now what?

I recently acquired a 1998 TJ Sport and have replaced the factory head unit with an Alpine CDA-105 with a SIR-ALP1 unit for Sirius radio. My problem is frequent signal cut out when listening to Sirius..

I had a friend make a mount similar to the Quadratec mount so I could mount it on the top of my roll bar which I assumed to be the highest, best place for it to go. My Sirius reception in the TJ sucks compared to my BMW that came with it as a factory option which rarely cuts out. The Jeep cuts out constantly (albeit briefly) near foliage or 2+ story buildings

Here's a picture of my mount and placement:

It is near the passenger side of the roll bar (you can see the soundbar behind it)--


A few questions:
-- Would a "micro-dot" antenna work better in the same spot?
-- Should I move my existing square DIRECTED antenna to the hood?

I read around that the roll bar may not have an effective ground plane for the magnetic mount antenna to receive signal. I will note that I never have the soft top on.

I really don't want to have to move it onto the hood unless I have to, but if it will improve my signal I will.

Any ideas? All thoughts/experiences would be extremely helpful.

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Old 07-20-2009, 06:37 PM   #2
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Would a better option be a taillight CB antenna mount with a Sirius truck antenna? Truckers always have good things to say about this antenna.

Amazon.com: Sirius Truck Mount Antenna: Electronics

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Old 07-21-2009, 12:52 PM   #3
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i have my antenna sitting on top of my soundbar and have no issues with loosing a signal.
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Old 07-21-2009, 01:12 PM   #4
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weird, i had xm magnetic antena located on the trunck of my car while i drove from west palm beach fl to las vegas and never lost the signal.
in the car the signal was lost only going thru tunnel or couple story parking lot.
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Old 07-21-2009, 01:43 PM   #5
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Well I have since found that I am actually near a terrestrial repeater, so I'm beginning to suspect I have a good-ole defective antenna. I ordered a new high gain dot antenna and am going to give it a try.

Will post back with results.

Thanks for your time and assistance.
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Old 07-23-2009, 02:10 PM   #6
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i have my antenna on my sound bar w/o issues. could be a bad one or pinched wire. now a big thing w/ these antenna's is making sure nothing is above them and that they are on a good ground plane... thats why when ppl lay one on a dash they suck they need to be on trunk/roof...for us thats either hood, music bar (if metal) or rollbar. i don';t like hood myself. you may need to mess w/ it some on the road till you get a good spot
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Old 07-26-2009, 10:05 PM   #7
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Thumbs up

Got a new high-gain low profile antenna, mounted it on the driver's side behind the soundbar. Works 1000% better than the last and got rid of my drop outs. I think I either broke the existing antenna while installing it, or it was already cooked.

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