resistive sheet(Salisbury Screen)

Salisbury Screen is a kind of absorber.

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This absorber uses a resistive sheet having a resistivity close to that of free space (377 Ohm).
Can I get such a sheet? Could you tell me manufacturer's websites?

Start here: Emerson & Cumming, Inc. Woburn, Mass.: or Cumming or Advanced Electromagnetics Inc., or Rantec. There are other sources for various absorbing materials but these come immediately to mind as possible sources.