With the aid of a radio station in Daventry, England, and two receiving antennae, Scottish engineer and inventor Robert Watson-Watt first demonstrated the use of radar.

Daventry is a market town and civil parish in the West Northamptonshire unitary authority area of Northamptonshire, England, close to the border with Warwickshire. At the 2021 Census, Daventry had a population of 28,123, making it the sixth-largest town in Northamptonshire.

In radio-frequency engineering, an antenna or aerial is an electronic device that converts an alternating electric current into radio waves (transmitting), or radio waves into an electric current (receiving). It is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. In transmission, a radio transmitter supplies an electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves. In reception, an antenna intercepts some of the power of a radio wave in order to produce an electric current at its terminals, that is applied to a receiver to be amplified. Antennas are essential components of all radio equipment.

Sir Robert Alexander Watson-Watt was a British radio engineer and pioneer of radio direction finding and radar technology.

Radar is a system that uses radio waves to determine the distance (ranging), direction, and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track aircraft, ships, spacecraft, guided missiles, motor vehicles, map weather formations, and terrain. The term RADAR was coined in 1940 by the United States Navy as an acronym for "radio detection and ranging". The term radar has since entered English and other languages as an anacronym, a common noun, losing all capitalization.