I would call Sirius and ask. I've had Sirius XM in my cars since 2008 and any kind of obstruction absolutely blocks the signal. Even tree leaves which are not contiguous block the signal.
Same for home receivers, heck they loose signal when obstructed by thick clouds from a storm Unless there's some kind of magic to the boat receivers, it needs a view of the sky. >From Sirius's website: Make sure the radio has a clear view to the sky (not blocked by a garage, large trees, or buildings). -Francois Rivard 1990 34+ "Take Five" Lake Lanier, GA
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