The AN/APG-78 Longbow is a millimeter-wave fire-control radar (FCR) system for the AH-64D/E Apache attack helicopter.

It was initially developed in the 1980s as the Airborne Adverse Weather Weapon System (AAWWS) as part of the Multi-Stage Improvement Program (MSIP) to enhance the AH-64A.

[3] The radar is produced by Longbow LLC, a joint venture of Lockheed Martin and Northrop Grumman.

[4][5] The radome's raised position enables target detection while the helicopter is behind obstacles (e.g. terrain, trees or buildings).

[8] The updated AN/APG-78 radar for the AH-64E Guardian has overwater capabilities, potentially enabling naval strikes.