Reliable ways of generating cover/concealment at range

Question

Are there any magical items that can be used in order to reliably generate concealment at range, but do not impair/effect the user? Take the case of, say, an archer-archetype character. They may wish to fight at approximately 15-25 squares of range, and ideally from cover. However, not all battlefields will contain cover at the appropriate distances from the enemies. Ideally, there exists some item that:

1. Provides a high degree of cover/concealment.
2. Does not inflict penalties on its owner/user.
3. Can be used repeatedly.
4. Does not scream to the enemy "HERE! HE'S IN THIS SUSPICIOUS PLANT IN THE MIDDLE OF THE DESERT!"

Barring that, any items/powers which meet as many of those criteria as possible may be useful.

Answer 1

Some items based on searching for concealment:

• Several different armors offer concealment as a Power(encounter):
  
  • Armor of Night (AV p41) Lvl 14+ (cloth, leather)
  • Shadowflow Armor (PHB p231) Lvl 13+ (cloth, leather)
• Several items offer a Power(Daily) that creates a zone (sustain minor) that provides concealment:
  • Bottled Smoke (AV 168) Lvl 17
  • Jar of Steam ( AV 174) Lvl 7

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As a power/feat idea, using two feats to multi-classing as Wizard and swap a utility power, you could get

Blur Wizard Utility 10 Daily:

Effect: Until the end of the encounter, you gain a +2 power bonus to all defenses, and enemies 5 or more squares away from you cannot see you.

Answer 2

Phantom Chasseurs

Level 18, feet:

Property: if you move at least 3 squares on your turn, gain concealment until the end of your next turn.