This is what mine is doing. Retract is fine and it shuts off right away. Extending it keeps going after the antenna is fully extended and GRINDS GRINDS GRINDS as the teeth are slipping over each other. Sounds horrible. Does it for about 10 seconds.
My first thought was the plastic tooth line was too long but I remember it being exactly the same length as the stock one I took out (wasn't broken inside...just the mast got bent/broken from a branch). If I trim it and it then the motor can't grab it to retract it then I have to buy another antenna and still don't have the problem fixed.
Anyone figured out how to deal with this?
I also can hear the clicks from relays? down by my left foot...
I'm gonna go disconnect the power to the antenna tomorrow morning (wait...it is morning so I'll do it in about 9 hours when I get up

)