radar
radar
radar
radar
radar
You may be thinking of weather RADAR. It sends out radio waves, some of them bounce off of rain, snow, or the boundaries of layers in the atmosphere, and the radar receiver detects the waves that bounce off of something and come back.
A transmitter sends a radio frequency to a robot.
radio, cell phones
It sends out signals through the air to a radio tower.
A radio or microwave mast
Quasars
the Rising Action is when johnny (quarterback) sends radio into the girls locker room
The monitoring device is a radio transmitter that sends signals to the radio transmitter. Radio waves are a type of Electromagnetic waves.