| Transmission of common, public and confidential messages in broadcast channels with multiple antennas Recent countries visiting this post |  |
 | 5 | United States |
 | 3 | |
 | 1 | Germany |
| Transmission of common, public and confidential messages in broadcast channels with multiple antennas Recent countries visiting this post | |
| 5 | United States |
| 3 | |
| 1 | Germany |