On the first day of the month Radio Prague will announce the month’s quiz question on this site. At the end of every month we will draw six winners from the correct answers received. Join our contest and win a Radio Prague prize! Question for AugustOne of the significant chapters in the history of Radio Prague International was in 1968, when the Soviet-led invasion of Czechoslovakia took place. From which Czech transmitter did our signal spread from the 1950s until 2011, when a major reduction in shortwave broadcasting took place?