I was wondering where the CTC7 and ABC3 studios and masts were on Black Mountain prior to the Telstra Tower being built. I managed to find a site plan for the proposed Post Office Tower (this was when the PMG ran the post office, telephone system and the ABC’s transmission infrastructure), in the National Archives database. The two studio sites were turned into car parks.
The last time I drove up there I noticed that one of the concrete blocks that held one of the CTC tower guy-wires is still visible just beside the road.
Edit: Just to add, the then National Capital Development Commission wanted a far more traditional broadcast tower but the PMG wanted a tower that people could visit. After much argument parliament’s Public Works Committee agreed with the PMG.