GPS sender for speedometer

I'm using a GPS unit from Classic Instruments. I've used them before, they work fine as long as they can see sunlight. I got creative in mounting my GPS, I cut out the speaker enclosure, welded in a box with a lexan cover. The GPS works fine. Here is a picture of it mounted in the dash. I buried a 2007 300C radio antenna in the box as well but it isn't working.
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That is slick...... Very nice work