What causes the most signal attenuation, based on the wireless design tools?

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1. Study guide
   Table 2-2 Common Obstacles and Their Estimated Attenuation Values
   Object in Signal Path Signal Attenuation Through the Object
   Plasterboard wall 3 dB
   Glass wall with metal frame 6 dB
   Cinderblock wall 4 dB
   Office window 1–3 dB
   Metal door 6 dB
   Brick wall 8 dB
   Concrete wall 12 dB
   Phone and body position 3–6 dB
   Phone near field absorption Up to 15 dB

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