The upper antenna of the TCAS II is:
Domanda 62, Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license
| Omni-directional because it is merged with the transponder antenna. |
| Directional because it is merged with the transponder antenna. |
| Directional to improve the surveillance of intruders. |
| Omni-directional to improve the surveillance of intruders. |
