Abstract: An anchoring apparatus for the mast on vehicles is adopted for use on an extendable mast mounted on a movable vehicle body to prevent the erected and extended mast from wobbling in the wind. The anchoring apparatus has a plurality of support posts located around the periphery of the vehicle body and equally spaced from the mast. The support post may include an upper support post and a lower support post. The lower support post may movably rest on the ground surface to support the vehicle body and have a bottom end linked tightly by a steel cable or rod to a neighboring bottom end. The upper support post may be movably extended outwards from the vehicle roof with an outer end linking to the top end of the mast by a steel cable. The outer end of the upper support post and the bottom end of the lower support post may be linked tightly by a steel cable under tension. Thereby the mast can be erected and anchored steadily.