En 50147-1 Pdf !!top!! -

If you cannot access EN 50147-1, consider these:

: Two antennas (transmit and receive) are set up at a fixed distance with no barrier between them to establish a baseline signal level. Shielding Measurement en 50147-1 pdf

No. GTEM cells use a different principle. For GTEMs, refer to IEC 61000-4-20. EN 50147-1 is exclusively for metal enclosures with absorber lining. If you cannot access EN 50147-1, consider these:

references EN 50147-1 as a baseline for measuring planar materials, though it proposes a new method based on skin-effect transmission. ResearchGate EVS-EN 50147-1:2002 If you cannot access EN 50147-1

Title: Anechoic chambers — Part 1: Shield attenuation measurement