Well plastic is not a shield for RF interference ether
The small metal ring that is left is part of the shield I use copper tape to make up the rest. Its pretty simple. The exit hole for the cable is the only that that cant be shielded. But again its a small exit hole. Its not perfect but like I said keep in mind the body of this mic is PLASTIC and not shielded in any way except for the braided cable that connects it.
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Interesting. I figured AT would have it shielded. I have one I think I might open up.