plate 98 may be affixed to the ceiling to indicate the relative position of the antenna structure the knob is preferably provided with a friction producing circumference as by molding a plurality of vertically extending ribs thereon and the knob includes a recess 100 concentric with the knob configuration the shaft 54 is rotatably mounted within the housing bearing 28 and extends through the stem 92 and is keyed to the crank 102 rotatably located within the knob recess 100 fig3 the crank includes a handle 104 and it will be appreciated that rotation of the handle 104 crank 102 shaft 54 and pinion gear 52 may be readily achieved from within the vehicle from the above it will be appreciated that both the extension and retraction of the dipole assemblies 42 and the rotation of the column and antenna structure may be readily and easily achieved from within the vehicle and the direction of orientation of the dipole assembly is readily appreciated by the relative relationship of the knob 94 and the plate 98 it is also within the purview of the invention to use electric motors to rotate the column 10 and extend and retract the antenna dipole assemblies 42 and in such instance electric motor structure is mounted within the housing 16 in fig8 and 9 a motorized embodiment is shown and primed reference numerals are used to denote previously described components a motor 106 includes transmission step down gearing 108 connected to the column 10 39 for rotating the column and the motor 110 and associated transmission 112 is operatively connected to the shaft 54 the motors 106 and 110 are reversible and controlled by conventional electrical switches schematically shown at 105 and 109 respectively and the motors are powered through the.