The directional antenna is a phased array antenna. There are
four array elements on the antenna. Each element has a color
coded connector. The TCAS computer sends transmit
interrogation signals to the array elements with different
phases. This makes the interrogation signal directional.
To attach the antenna cables, connect each coaxial cable with the array element connector that has the same color band.
Four screws attach the antenna to the airplane. The radiation side of the antenna shows FWD and DO NOT PAINT.