Orange Harvest

Although less precise than the Shackleton's main ASV.21 search radar, it could give a greater detection range,[1][2] provided that the target was emitting.

As these boats could now run continually submerged, without even needing to snorkel, they were increasingly difficult to detect by previous methods, such as Autolycus or search radar.

The external antenna for Orange Harvest was the distinctive white dielectric 'spark plug' carried on the upper surface of the Shackleton.

The Shackleton did carry HF antennae, but these were supported by two small metal masts, just ahead of Orange Harvest.

The structural fitment for Orange Harvest was a metal plinth built into the fuselage, at approximately the previous dorsal turret position.

Front half of a Shackleton aircraft. The Orange Harvest antenna is visible as a ribbed white cylinder on top of the fuselage.
WR977 'B – Basil ' at Newark Air Museum . The Orange Harvest "spark-plug" antenna can be seen on the top of the fuselage just to the left of the outboard propeller tips.
Orange Harvest external antenna of XF708 at Duxford
View inside the Shackleton cabin, looking forward past the row of operator desks along the port side.
Shackleton interior and operator positions. Orange Harvest is at the very far left
Memorial cairn to WR965 on the Isle of Harris