Apparently, the power of the RTS-transmitter on mountain Kopaonik in Central Serbia has been slightly increased and now radio Beograd 1 on 90,9 can be received with constant (but weak) signal at my location with a 5-element horizontal yagi.
The distance to this transmitter is 217 km. making it the remotest Serbian transmitter I am able to receive at home:.
http://i45.tinypic.com/2wf1vlt.jpg

The comparison is with 91,7 from Besna Kobila (85 km.) and 92,5 from Tupiznica (152 km.), both visible on the map above. (less info)