We tested a drone as a way to inspect a sailboat mast. Need to climb 60 feet to see whats at the top? Use a drone first. Might save you the trip and the photos are in great details.
In this case we used a Yuneec Typnoon Q500 - 4K and a Yuneec Breeze. The breeze is flown using he smart phone as a controller.
Check out the video here, Drone mast inspection