REMEMBER You must be able to have VISUAL contact with your drone. you must also be able to know the Drones orientation with the unaided eye... At 1 mile thats not possible.
Sure your drone will fly 3 to 4 miles out ....BUT not legally.
Yeah, problem is all those pesky leaves, diffusing our signals and redirecting them in every bloody random direction !
I did some tests with my Mini Pro 4 a while back, dropping down behind varying thickness banks of trees and other foliage to...