Stealth generator
From Command and Conquer Wiki
The Stealth generator was a massive structure that made extensive use of Nod's active cloaking technology. It generated a large "stealth bubble" that warped light and rendered all units within the bubble invisible to the naked eye or regular sensor equipment. However, it's main drawback was the amount of power it needed to function properly. During the Firestorm Crisis, Nod built Mobile stealth generators which could be used to 'creep' an assault force right up to the enemy base.
The Mobile sensor array was able to scan through its cloaking field. The Stealth generator also required huge amounts of power and would shut down during blackouts.
Nod constantly developed their stealth technology and by the Third Tiberium War was able to develop an inexpensive, but effective, replacement for the stealth generator - the Disruption tower.
