Still (and after the collapse of Warszaw Radio Mast in 1991 again) the tallest construction on earth is the 628.8 metre high KVLY-TV mast at Blanchard, North Dakota, USA, which was completed on August 13th, 1983.

http://upload.wikimedia.org/wikipedia/en/8/84/KVLYDistance.jpg
KVLY-TV mast

Further informations on:
http://www.structurae.net/structures/data/index.cfm?ID=s0000675
http://www.kvlytv11.com/info_tower.html
http://wireless2.fcc.gov/UlsApp/AsrSearch/asrRegistration.jsp?regKey=608746
http://www.skyscraperpage.com/cities/?buildingID=471
http://www.skyscraperpage.com/diagrams/?b471

Stunning. I wish they had an observation deck;)

Nice. give us some more detailed pics.

Great pics here: http://www.pbase.com/talshiarr/kvly

yes. its bl00dy tall.
lets go climb it.
http://mishilo.image.pbase.com/u33/talshiarr/large/21526581.KVLYSunset.jpg

Can we get more of a detailed picture.

You're wrong:
http://www.skyscraperpage.com/diagrams/?10944863

Looks very thin! Maybe would look more impressive if it would be wider.