I am assuming it was a Shofar, calling people to prayer and repentance..but what do I know?
From the following article:
....Hagee was one sign of how pro-Israel the crowd was. You didnt have to look far for others. There were men blowing shofars (a rams horn, a Jewish tradition), wrapped tallit (prayer shawls) and wearing jewelry displaying the Star of David. Dispensationalists and other evangelicals looking toward the Second Coming tend to hold special favor for Israel.....