Unless the contest specifies otherwise (like "win front row seats!" or "win floor tickets!", typically concert promoters don't give prime seats to radio stations for giveaways. They have blocks of seats that are designated for promotional giveaways. You'll likely be in the upper level, maybe off to the side of the stage. But you'll be at the show for free, so it's nothing to complain about. I don't know how they determine the "value" of the prize, but it probably has nothing to do with what the tickets sell for.