Antenna mounting apparatus for a combine harvester is provided. The apparatus comprises a first grain tank extension panel mounted to a frame so as to be moveable between an open, extended, position and a closed, retracted, position. An antenna-supporting bracket is pivotally mounted to the grain tank extension panel around a first pivot axis. Actuation means are provided to pivot the antenna-supporting bracket with respect to the grain tank extension member when the grain tank extension panel moves between the open position and closed position.
