I had a friend just recently lost his drone over the Gulf of Mexico. He is a experienced operator not someone new, calibrated it & all looked good. Flew it up & hovered it approx 15' to make sure all controls worked properly etc... as he flew upwards approx 80' it took off over the water never to be seen again. There is however a FM radio station close by, I'd say within 1/2 mile or less that might have contributed to his lose. That made me question, how far away should you be from a radio station tower or high power transmission lines as so it does not interfere with your Phantom. DJI says stay clear of flying near these but does say anything about a safe distance. I would like to hear your thoughts &/or experiences.