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I have a 2007 E550 with Sirius radio. I started having reception issues a few months ago. After looking into everything outlines in this forum concerning possible issues, I have come across some data that holds consistent. I know this will sound crazy, but in the morning (temps less than 80F or so), the radio works fine with very little interruption. As soon as we top 85F and up for a short period, the radio stops and shows an "Acquiring Signal" message and will not come back on until it cools down in the evening and the radio works again.

Is there anything that could cause an antenna or reception error when it is hot? Or am I just crazy??

Is there a satellite radio antenna module?
 

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The antenna is in the Sharkfin on the roof. The SDARS receiver is in the trunk inside a plastic housing that holds the CTEL electronics. You could try placing a cool damp cloth around the Sharkfin when it loses reception for a few minutes to see if it returns to narrow down the problem to the antenna connection or the SDARS receiver.
 
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