Editing Direction finding (section)

====Watson–Watt, or Adcock-antenna array====
{{main article|Adcock antenna}}
The [[Robert Watson-Watt|Watson-Watt]] technique uses two antenna pairs to perform an amplitude comparison on the incoming signal. The popular Watson-Watt method uses an array of two orthogonal coils (magnetic dipoles) in the horizontal plane, often completed with an omnidirectional vertically polarized electric dipole to resolve 180° ambiguities.

The [[Adcock antenna|Adcock antenna array]] uses a pair of monopole or dipole antennas that takes the vector difference of the received signal at each antenna so that there is only one output from each pair of antennas. Two of these pairs are co-located but perpendicularly oriented to produce what can be referred to as the N–S (North-South) and E–W (East-West) signals that will then be passed to the receiver.  In the receiver, the bearing angle can then be computed by taking the [[arctangent]] of the ratio of the N–S to E–W signal.