Quadcopters and the like are generally fairly limited on flight time..10-20 min generally from what I've read. For your range, you might want to go with a air wing/rc plane..but diydrones would still be a good place to get up to speed on the capabilities.
I'm pretty sure this is the graphics system the Phantom console is going to use.
Scott Hanselman has a couple of posts that are very similar to what you're looking for and easy to setup.
http://www.hanselman.com/blog/VirtualCamaraderieAPersistentVideoPortalForTheRemoteWorker.aspx
http://www.hanselman.com/blog/SkypingTheWifeFoolproofVideoConferencingWithYourFamilyWhileOnTheRoad.aspx
This is the theory that Jack built. This is the flaw that lay in the theory that Jack built. This is the palpable verbal haze that hid the flaw that lay in...
