Attenuation in practice

With an attenuation of 6 dB the range is shortened to half of the value for an unobstructed connection, with 12 dB it is shortened to a quarter.

Material

Attenuation

Range approx.

Example for an unobstructed range of 280 m

Thin wall

2 … 5 dB

(free field range)/1.5 - (free field range)/2

180 m … 140 m

Wooden wall

5 dB

(free field range)/2

140 m

Masonry wall

6 … 12 dB

(free field range)/2 - (free field range)/4

140 m … 70 m

Concrete wall

10 … 20 dB

(free field range)/4 - (free field range)/8

70 m … 5 m

Concrete ceiling

20 dB

(free field range)/8

< 35 m