There is no attenuation due to absorption, but attenuation will
occur due to divergence (spreading out) of the wave.
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6 dB is a "good" attenuation.
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We can reduce attenuation effects bt using repeaters
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breast attenuation correction meethods
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Attenuation means the reduction of signal strength during
transmission. If one is looking for information about attenuation,
it can be found on the Wikipedia website.