Abstract: An airborne observational apparatus is disclosed which is capable of staying in the air for an unlimited period of time. The apparatus includes a ground located, continuous electric power source and an aerial device which is connected permanently to the said power source by a tether cable. The aerial device has a conical shape body. At least one propeller is mounted on the top of the body including at least two rotating blades. The propeller is operated by an electric motor located at the lower part of the said body. The center of gravity of the aerial device will be in its lower part. The tether cable is connected to the aerial device by a preferably U-shaped member on the upper side of the conical body in a pivotal manner. The aerial device has self balancing capability even in strong gusting wind keeping the aerial device in vertical or slightly inclined direction.