You're right Mike, it's a manual one.
WHen I got the wagon a month ago, and the antenna mast was bashing
against the garage door at work, I took a wrench, disconnected the
mast, then gently bent it back so that it would be pointed backwards,
hopefully missing the door.  Problem was that I didn't mark the rear of
the mast, so that when I tightened it, it was pointing sideways.
Mistakenly, I tried to tighten it an extra 1/4 turn to point it back,
and then (you guessed it), the thing snapped off.  Had to go to Volvo
and buy a new kit, because the connector at the vehicle body had
snapped off in the mast.  Now I have a new mast, and will probably try
to bend again, but this time I'll mark the back part so when I
(gently!) torque it down with the little wrench, the mast will be bent
toward the back.  I was just concerned about possibly snapping the mast
in two if I bend too vigorously, so will go gently... (don't want to
have to buy another antenna kit!).  ANyway, lessons learned...