Abstract: The talk addresses the theory of antennas that transmit and receive the quasi-electrostatic waves in magnetoplasmas. The key feature of these waves is that they propagate close to the resonance cone direction. They are radiated and reradiated efficiently by the electric dipoles (antennas) that are much shorter than a wave length of a parallel (with respect to an ambient magnetic field) propagating electromagnetic wave. Some applications of this theory to the various measurements using antennas on board rockets and satellites in the near-Earth plasma are also discussed in the talk.