Physics Wave Optics Level: Misc Level

An FM radio station has a frequency of 107.9 MHZ and uses two identical antennas mounted at the same elevation,12.0 m apart. The antennas radiate in phase. The resulting radiation pattern has a maximum intensity along a horizontal line perpendicular to the line joining the antennas and midway between them. Assume that the intensity is observed at distances from the antennas that are much larger than 12.0 m.At what angles (measured from the line of maximum intensity) the intensity is maximum and at what angle is it zero.