Artificial satellites

Satellites revolve around the earth from space. Because of the gravity of the Earth, it turns around. So it does not cost any fuel to keep it in space. We know that the Earth revolves around its axis for twenty four hours. If the satellite is to turn the earth once in twenty-four hours, then it will seem from the Earth that it remains fixed in one place in the sky. Such satellites are Geo stationery satellites. Such satellites can not be kept at any height. There are two problems with satellites. A large antenna is needed to send a signal to the satellite. And the next problem is that the signal that is sent from the Earth is faster but it takes a little longer to exceed the distance. There is no other problem.