When you stand too far away from someone who tries to talk to you, you can't hear what she says because the sound waves she emits don't reach your ears. Wireless line-of-sight communications ...

After developing a link discovery method in 2020 using terahertz radiation, researchers addressed what would happen if a wall or other reflector creates a non-line-of-sight path from the base station ...

An unobstructed path from a transmitting device to the receiver. Users are aware of line of sight when they aim their infrared (IR) remote control directly at the TV. Microwave transmissions between ...

A reader wrote us to say he's barely able to connect to the Internet wirelessly, even though his phone is just 20 feet away from his AT&T router. Two bars is the best he gets. We told him to call AT&T ...