A phase shift between the two antennas changes the interference pattern established by the baseline B.

For example a phase shift of 180° or π/2 ≈ 1.5 shifts the fringes to the position between the peaks:

Thus, in large arrays of antennas, one may shape the radiation pattern into freely stearable beams. This has been used in radar and is used in the large instruments like LOFAR, NenuFAR, and SKA.

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