Plexiglass Shield

We are installing some card readers for vehicle gates on gooseneck mounts. The spec calls only for the gooseneck, no back box or rain-hood. There IS however an 18" x 18" plexiglass sheet specified to be installed between the gooseneck and card reader. That's dramatically bigger than the card reader.

When I asked the architect why they made this choice, I was told: "[The plexiglass] provides a radio interference barrier with the gooseneck".

Does this make any sense to anyone? I've never heard of the practice, and I have installed plenty of card readers on plenty of metal surfaces without issue.

I can see how spacing it away from the gooseneck with a non-conductive material might have an effect, but plexiglass is radio transparent, right? That oversized sheet isn't actually accomplishing anything is it?

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