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I've been using the XM Helix for a year now. I have it wired into my 911 and the antenna is in the back window with no issues. I also use in my garage set up with an antenna mounted high and shooting out the southern facing windows. I'm getting 3 bars of reception. I would try to relocate your antenna first. I would also try and see if your antenna is not faulty. I just had one replaced for my car that used XM. The signal would drop out repeatedly until I had them replace it and now it is perfect. I've heard that Sirius's signal is even better, so this shouldn't be a problem. I also use XM at my business and would have spells of poor signal strength. I got a 50 foot extension with a booster and have it facing out a southern window. It works fine.
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