Was up here for the views, caches and trig just before new year and I suspected that these towers were trigs. You can see these from well before you get to Bathurst so they serve a purpose for long range navigation. Easier to spot than the little plinth of 'Canobolas' trig nearby. Two for the price of one in this photo. ABC1 is the large red and white topped one on the right, CNB8 is to the left of the GPSr.