Under command of the 8th Signal Regiment, it currently resides in Karrakatta in Western Australia in support of the 13th Brigade.

109th Signal Squadron moved to Lord Street in East Perth in 1974 and remained there until 1987.

Early in 1988, the unit moved to Leeuwin Barracks, East Fremantle, and came under the command of Headquarters 13 Brigade.

Its establishment was changed to be along the lines of an Australian Regular Army Brigade Signal Squadron.

[2] In 2006 under Project Focus, all supporting non-Royal Australian Corps of Signals elements, excluding limited logistic staff were reallocated to dedicated corps units as part of a project designed to enhance and streamline C2 and administrative arrangements.