Here's a good looking ground antenna tracking unit with pan and tilt servos for $90.
From the product description:
"Antenna pan/tilt assembly kit designed to work with the ImmersionRC EZ Antenna Tracker. Designed to hold patch antennas, with direct mounting points for L-Com 8dBi, 14dBi, and diversity Patch antennas. May work with other antennas as well.
Includes two HS-485HB Servos, Gears and rotation hardware, 1/4-20 tripod mount, hook-and-loop and double sided tape for holding Duo2400 and EZ Antenna Tracker, standard 1/2" 1/4-20 and 10-24 bolts for antenna mounting."
Although it's designed to work with a custom electronics unit, which in turn works with EzOSD, it looks like it would work as well with ArduStation.
Here's a video of it in action. Check it out--it's really cool: