Able Sniper( Races of the Wild, p. 148)
You are accomplished at remaining unseen when you're sniping with a ranged weapon.
Hide 5 ranks, DEX 13,
You gain a +2 bonus on ranged attack rolls with a weapon made against flat-footed targets that are at least 30 feet away. In addition, you gain a +4 bonus on Hide checks made to hide again after you have made an attack roll while hiding (see page 76 of the Player's Handbook).