Here's the latest set of changes & revisions to the archetype. It includes a stealth related feature Sniper's Perch.
Deepwood Sniper (Ranger Archetype) - Version 4
Original Appearance: Prestige Class in Masters of the Wild (WotC #88164)
Conversion by: Valkyn Highwind
Magic Weapon (Sp): At 1st level, the character can produce an effect identical to that of a magic weapon spell cast by a cleric of her deepwood sniper level. At 8th level, this effect becomes greater magic weapon. This ability is usable once per day on projectile weapons only. This feature replaces Track and Swift Tracker.
Hawkeye (Ex): A deepwood sniper, starting at 1st level, gains a +1 bonus on Perception checks, and the range increment for any ranged projectile weapon she uses increases by 5 feet. These bonuses increase by +1 and 5 additional feet for every 4 levels beyond 1st. This ability replaces Wild Empathy.
Accuracy: At 3rd level, the deepwood sniper gains Weapon Focus with a ranged projectile weapon of their choice as a bonus feat. This feature replaces Endurance.
Sniper’s Perch (Ex): Starting at 3rd level, and every five levels thereafter, the deepwood sniper can reduce the penalty for maintaining their hidden location by -4 (ie. 3rd is -16, 8th is -12, etc.). This feature replaces 1st Favored Terrain.
Take Aim (Ex): A 7th-level deepwood sniper can gain a +2 bonus on her attack and damage rolls against a stationary target by aiming carefully. Taking aim is a full round action, and if the target moves more than 5 feet during that period, the bonus is lost. No additional benefit exists for spending more than 1 round aiming. This bonus increases to +4 at 11th level. This bonus applies only to the first shot made or until the end of her next turn. This feature replaces Woodland Stride.
Keen Arrows (Ex): At 9th level, all projectiles the deepwood sniper fires behave as if they were keen weapons in addition to any other properties they might possess. Thus, a normal arrow fired by a deepwood sniper has a threat range of 19 - 20 instead of 20, and the critical multiplier increase by +1. At 16th level, the critical threat range increases to 17 - 20. This effect does not stack with any other keen effect. This feature replaces Evasion and Improved Evasion.