Forwarding you to en.wikipedia.org

Plasma antenna - Wikipedia

A plasma antenna is a type of radio antenna currently in development in which plasma is used instead of the metal elements of a traditional antenna. [1] A plasma antenna can be used for both transmission and reception . [2] Although plasma antennas have only become practical in recent years[ when? ], the idea is not new; a patent for an antenna using the concept was granted to J. Hettinger in 1919. [3]