Antić was a member and captain of the senior men's Republic of Macedonia national team. He was instrumental in his team reaching the semi-finals of FIBA EuroBasket 2011 in Lithuania. Antić proved his reputation as one of the tournament's best rebounders, having an average of 8.8 rebounds per game, third best in the category. He also averaged 11.5 points per game, with his tournament high coming in the semi-finals against Spain, where he scored 17 points in a 92-80 defeat. He was among the overall leaders in several other categories. Besides being fourth in average minutes per game (34.5), he also ranked fourth in double-doubles, collecting three, against Finland (14 points and 19 rebounds), Bosnia and Herzegovina (15 points and 14 rebounds) and Russia (15 points and 10 rebounds). While hardly the revelation of the tournament, he fulfilled his full potential at the EuroBasket, and was the cornerstone of the Macedonian national team's defensive strategy, that propelled them to the top four.