Interference/noise

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I have a pioneer hu and the pioneer XM reciver that goes with it.

When i have my hu on tunner/cd player theres generaly no noise (except for a little engine noise, but i plan on trouble shooting that tomarow). but when i switch to XM, theres a quite loud hiss you would expect to hear from like a tape deck. Is there a problem with my system? could it be the XM antenna? the "IP bus wire" to the XM reciver? Im a bit upset im having this problem with something i pay for monthly :(
 
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