Telescoping Pole / Rod / Antenna

I'm looking for a motorized (dc motor / stepper motor driven) telescoping pole or rod or antenna that I can mount a pan/tilt servo setup onto. I am going to put a small camera on the pan/tilt and am going to use the arduino to control the pan/tilt as well as the height of the pole. I was thinking of a more sturdy version of an electric car radio antenna, but google doesnt seem to return anything usable. Anybody have a suggestion or already know of a motorized telescoping pole???????

You can make one yourself using a rack gear, just attach this to your rod, and use a dc motor to drive it: