I only make out three launchers and it isn't clear that they have missiles mounted. There looks to be anothet three launchers clustered in the parking area of the buildings.
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Perhaps there is some rotation of activation among the three sites with one or more taken out of service for rest / maintenance.
The presence of all of these elements at a site with paved roads and permanent buildings leads me to believe that this is the missile unit's garrison facility. Some sites have only three launchers instead of four, as that is all they have operationaly available.
4-rail SA-3 launcher - http://www.vucjak.com/srpska_vojska/vojna%20SA-3.jpg
Low Blow radar - http://images.google.com/imgres?imgurl=http://www.fas.org/nuke/guide/russia/airdef/low_blow2.jpg&imgrefurl=http://www.fas.org/nuke/guide/russia/airdef/s-125.htm&h=478&w=612&sz=41&tbnid=St0-3ELzADAJ:&tbnh=104&tbnw=134&hl=en&start=30&prev=/images%3Fq%3D%2522low%2Bblow%2522%26start%3D20%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DN
SA-3 transporter with missiles - http://www.fas.org/nuke/guide/russia/airdef/sa-3-DFSN8301210_JPG.jpg