Abstract: A mobile tower supporting a radar antenna system including a drive system and position resolvers, the antenna system being mounted at the top of a cylindrical telescopable mast which is hinge mounted on a tripod base and is erected to a vertical operative position by an hydraulic ram which also retracts the mast to a substantially horizontal position for transport or servicing by personnel standing on a pallet supported by the base, the tower further including tilt and twist monitors having outputs coupled to a computer together with the outputs of the position resolvers to provide a corrected readout of azimuth and elevation angles of tracked targets.