A Young physicist wants to send radio signal to two separate cities (A and B); however, the signals being sent to one city should not be perceived in the second city and vice versa. Determine the distance d between the two antennas, the phase difference between the signals emitted, and the angle of the plane passing through the two antennas.
Given: frequency f, and the angles to cities A and B (72deg and 157deg, respectively) with respect to North