The invention provides an elongated structure comprising a pole having a wall around a hollow core as a tubular body part extending along a length axis. A base section of the wall of the tubular body part is connected to an H-shaped frame extending from a foot of the pole along the length axis, said H-shaped frame being arranged in the core. The wall at the location of the H-shaped frame is provided with a door, said door in closed position being flush with the wall and in opened position providing access to the core.