Back when the Diefenbunker was operational(see CFS Carp for more info on the Diefenbunker) a remote location was needed to house the antenna that would receive any radio signals coming in to the bunker. There were two of these such "RX" sites, one here outside Almonte and a second outside Dunrobin On. A third site near Perth On. Housed a two level communications bunker that housed the transmission "TX" equipment. This site has been very well buldozed today however. The "RX" site here has been little disturbed, the antennas have been taken down and the buildings blast door has been welded shut. Many concrete antenna bases remain and the one building.