Antenna tilt: angle between the antenna emission direction and the horizontal direction.
http://localhost:7890/pages/DEE1226D/05/DEE1226D/05/resources/dc/images/fig_dc_wlan_faq_00009801.pngField angle: angle between the two directions opposed to each other over the beam axis for which the luminous intensity is half that of the maximum luminous intensity.
The field angle often refers to the beam angle.
http://localhost:7890/pages/DEE1226D/05/DEE1226D/05/resources/dc/images/fig_dc_wlan_faq_00009802.png
