>It does if  .........

>(1) it has at least TWO independant layers of VERY fine and high quality mesh
>(2) is Soldered or bonded at ALL the seams and has absolutely no holes (eg
>no windows and doors)
>(3) and all cables passing through (eg mains, phones) have low pass filters

>And BTW, earthing makes little difference at VHF/UHF.
>  (how many wavelenghts is the earth lead?)

The other thing that needs to be done is to bond the inner cage to the outer
cage at ONE POINT ONLY. This is normally done at the point where the cables pass
through. This means the door has to have 2 separate connections, one for the
outer cage and one for the inner cage.

The room I used one had mesh which was about 1/8 inch square holes. We were
trying to develop a heart monitor in the same room as someone else was working
on a VHF 25 watt transmitter without a case on it!