Radio waves are defined by the ITU as: "electromagnetic waves of frequencies arbitrarily lower than 3000 GHz, propagated in space without artificial guide", Radio Regulations, 2020 Edition. International Telecommunication Union. Archived from the original on 2022-02-18. Retrieved 2022-02-18.
Radio waves are defined by the ITU as: "electromagnetic waves of frequencies arbitrarily lower than 3000 GHz, propagated in space without artificial guide", Radio Regulations, 2020 Edition. International Telecommunication Union. Archived from the original on 2022-02-18. Retrieved 2022-02-18.