Satellite radio/GPS is based on line of sight. Going in a tunnel, under trees will cause you to loose reception. New technology out there can actually use signal reflected off of building but I haven't seen it in sat radio yet. With my 350z, I had it mounted under the plastic covering of the shock tower brace in the back, plastic doesn't interfere with that frequency. Its all about the sensitivity of the detector. If that is your only issue (losing reception under trees), you're placement is fine just have older technology.
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