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I think that an antenna that goes through that roof, for reception/transmission... or perhaps a range extender, placed outside or beyond the metal roof (they do sell weatherproof range extenders, I think) might be what you need.
However, I am not quite clear from your question as to what service you want to increase. Is it the cell phone service, or is it the Hughes satellite internet, or is it both?
Why did the Verizon booster have to be compatible with satellite internet, then, if you didn't want to extend the satellite internet but rather the cell phone service? Is it a satellite phone service? or: What cell phone (by maker and model) do you have, and what service does it use (if you know) ?