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www.swisswireless.org/wlan_calc_en.html

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Posted by crouse

The higher the frequency of radio signal,the greater the free space loss.
Free space loss increases with distance

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Posted by waqqas1

AGREED WITH THE ABOVE ANSWER also to add, Free space loss increases with distance i.e., double the distance the signal strength is reduced by 6dB.

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Posted by ragupathi_ece

Free space loss describes the attenuation of radio signal over a given distance,or the path length of the signal.
The higher the frequency of radio signal,the greater the free space loss.

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Posted by sagitraz