They will last better with nothing... UV has virtually nothing to do with their demise. It is the freeze-thaw cycling that breaks them down. Putting a film over the works will cause the film to hold bigger chunks and when they start breaking out it will lead to more "erosion" faster.
UV does not go very deep and the oxidized surface layers will "protect" the antler material underneath. I have seen lots and lots of treated and untreated antlers left in the weather.
YMMV...
Mark Begich, Joaquin Jackson, and Heller resistance... Three huge reasons to worry about the NRA.
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