According to
http://skps.wroclaw.pl/wieczorynki/wiecz09.php there was until Fall 1990 the 140 metre tall wooden radio tower, which was built by German engineers in 1932 ( after 1976 it was not in regulary use any more after the still existing 258 metre tall guyed mast was built).
Perhaps has one of the forumers a picture of it. If yes, it would be great!