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5 kills
Remote controlled missile
The Predator missile is unlocked after getting 5 kills in a row or 4 with Hardline. Basically the Predator missile allows the player to remotely control one Hellfire AGM (Air-to-Ground Missile) that is deployed via an UAV. He can now guide it towards enemy players and the missile will explode upon impact. You will get out a laptop when calling in your Predator missile so you can be killed whilst using the killsteak, which makes getting into a corner a good idea when calling it in. You will be able to see the enemies clearly as a red square will highlight them being in control of the missile. However, if they are using "Cold-Blooded" you won't be able to see them. You can speed up the missile by holding the "fire" button. This will send down the missile at almost double it's speed, but it will be much harder to control and steer.
Strategy
The Predator missile is one of the most used killstreaks in Modern Warfare 2 and for good reason, when attached with "Danger Close" perk the blast radius of the hell-fire missile is increased to a massive amount, allowing you to get triple and quad kills. It's best on small to maps if you are aiming to get multiple kills. You can especially get easy kills when the players are running out of spawn. If used on large maps such as Derail it's a lot harder to get multiple kills as not many enemies will be running next to each other. This killstreak is normally used by players you will use the "Harrier Strike", so be on guard if some calls in their Predator missile and try to get your "Stinger" out as more often than not a Harrier will be in the sky in the next minute of so.
https://callofduty.wikia.com/wiki/Call_of_Duty_Wiki