mine (1977)and every other 6 I've seen has been power. However, due to the cost of a new one, a previous owner prob. replaced it with a $7 radio shack or the like replacement "fixed" antenna. When they break, its usually not the motor itself, but the plastic-toothed mast extender, thats repairable as Hirschmann sells replacement kits as well as new entire motors. The reason I think power was all that was offered is that a guy I knew that had a yard full of '77 630CSi's and restored them, thats all that I ever saw!