I've modified Phillip Anthony Smith's Mavlink Ardustation to support an inexpensive tilt/pan antenna platform. RAM is very tight in the software so this is not a laptop/ground station replacement and the original software was oriented towards APM. However, I've been flying many flights with Arducopter 2.0.x and this antenna and have gotten pretty good video performance with much less multipath interference. I still use a second Xbee on a notebook with the Mission Planner and that seems to work pretty well with the Ardustation. This link gives some more details, a demo video of the software with some explanation of the added screens, and the software itself for others to play with. The software is a little rough since it was developed quickly before the 4th of July weekend, but it is fun to watch the antenna follow the quad and I wanted to give a little back to the Arducopter community.