XM antenna to sirius adapter

i want to run my Sportster 5 and dock. i see there is an adapter available [FONT=&quot]http://www.myradiostore.com/p/sfa12f.html?_sNavAssistFrom=crsl-p2a1

3 questions:

1. anyone using this and if so, how's it doing?

2. it looks thick - the sirius end wire looks way thicker than the typical sirius antenna wire. that might be weird if i'm going to run it to my dock mounted on the windshield.

3. i've read that the XM antenna is not as capable as the sirius antenna, due to their broadcast differences. the internet says it will work, but will be about 50% as effective. anyone have data that says otherwise?

thanks, if anyone cares, lol.
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Thats what I am using, for my Sirius module run through the stock head unit.

 

what sirius unit are you running?

 

I am using that one too with this stuff. I have been using it for a good six months, probably more. I have had no problems with reception.