However, since microwaves were limited to line of sight paths, they might not talk past the visible horizon, and the low power of the spark transmitters then in use limited their sensible vary to some miles. Microwave expertise is extensively used for point-to-point telecommunications (i.e. non-broadcast uses). Microwaves are utilized in spacecraft communication, and much of the world’s data, TV, and telephone communications are transmitted long distances by microwaves between ground stations and communications satellites.