Our sky is bombarded daily by microwave frequencies.
Microwave frequency refers to a specific range of electromagnetic waves oscillating between 300 MHz (megahertz) and 300 GHz (gigahertz) within the radio spectrum. Simply put, frequency indicates how many times a wave oscillates per second. In the case of microwaves, they vibrate between 300 million and 300 billion times per second, placing them between radio waves (lower frequencies) and infrared light (higher frequencies).
They also bombard us via telecommunications antennas, Wi-Fi networks, Bluetooth, navigation and radar systems, GPS systems, and weather radars.