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The common kitchen aluminium foil works. We now use it in our lab to shield stuff. A few layers of it works much better than the expensive stuff from 3M.

Since most of the strong RF around us are in the S-band, around 12cm, you could just use a metallic mesh with holes smaller than that ( I would also recommend following the scienti…

There are so many established and commonly used grids, such as MGRS (military) or Maidenhead (amateur radio), this just makes things more complicated.