The invention proposes a solution to the problem of installing an antenna with long focal length on a satellite, and, as a non-limiting example, on satellites at a height that is less than the required focal length. It is based, on the one hand, on a reflector stored “inverted and head down”, and, on the other hand, on a deployment movement sequence employing a long arm taken up in the top portion of the reflector via an articulation (1 axis) and a conventional deployment mechanism (1 or 2 axes).