If you are looking at a quick and easy way of tracking your UAVs in realtime and are confident in your flying skills (because it is an expensive payload), can I suggest www.gpslogbooks.com?

It is an application that works on Windows Mobiles, Androids and iPhones if they have a GPS.  It uses the GPS to return realtime position information in 3D.  This can then be viewed on another mobile phone or on the web, with Google images.  The flights can be saved and downloaded in KML, so it is a pretty neat resource and makes it quite easy to track your UAV, as long as you are happy putting a phone in a UAV.  Bright side to it is if the UAV crashes, you will know exactly where it is.