What do you call something that blocks radio waves?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Puddle Jumping Looping

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Chapters
00:00 What Do You Call Something That Blocks Radio Waves?
00:33 Accepted Answer Score 19
01:55 Answer 2 Score 0
02:05 Answer 3 Score 0
02:28 Thank you

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