Abstract: An antenna coil includes a bar-shaped core, a bobbin, a coil, a case, and a wiring harness. The bobbin is formed of insulating material and has the coil wound around the bobbin with the bar-shaped core within the bobbin. The case is formed of insulating material defining a cavity having a cavity interior wall. The bobbin with the coil wound therearound is disposed in the cavity. The case has a protrusion extending into the cavity. The wiring harness is connected to the coil and disposed around a portion of a perimeter of the protrusion in a substantially omega shape and is disposed at least in part between the protrusion and the cavity interior wall. A flexible resin fills spaces in the cavity between the bobbin and the cavity interior wall.