Amusingly enough, disabling SSID broadcast under 802.11 results in more packets containing the SSID being broadcast. It does not give you any extra security, so it is best not to think of it as an extra protective layer.

some info here
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock