RE: Radio range increase?
Cool Yes, legal no, irresponsible yes! As someone said you are asking how to make a UAV. Lots of data on here as to how to, but are you really ready to pay the huge fine and court costs when your airplane crashes 26 miles away from you when you loose the tv image? And you MUST comply with the see and avoid requirements of FAR Part 91.
Try flying your plane with a safety pilot and within eyesight at all times.
T
Why yes I DO work for the FAA why do you ask?