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
Ya'll hear about the geometer who went to the beach to catch some rays and became a tangent ?
