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An aircraft that flies below radar is harder to detect than one in open sky due to a number of factors.
Battlefield 3
Below Radar decreases the thermal signature of aircraft flying at low altitude. It hinders spotting and prevents weapon lock from heat-seeking weapons.
Compared to Stealth, it allows aircraft such as helicopters to be more effective at close ground support. Low-flying aircraft are, however, more vulnerable to standard and wire-guided rocket launchers.
This unlock is a permanent upgrade, therefore it is constantly on during combat. Like a fourth upgrade.
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