 Because each antenna was aimed to be sensitive primarily in a single direction, the length of the blips depended on the position of the target relative to the fighter. For instance, a target located 35 degrees above the fighter would cause the signal in the upper vertical receiver to be maximized, causing a long blip to appear on the upper trace, and none on the lower trace. Although less sensitive directly forward, both vertical antennas could see directly in front of the fighter, so a target located dead ahead caused two slightly shorter blips, one on either side of the centreline.
