| Clue | Source | Date |
|---|---|---|
| Brief high-pitched sound carried by Uncle Sam's transmitters | The Telegraph Toughie | 25 Sep 2020 |
| Comms connections to satellites | The Times Concise | 05 Jul 2017 |
| Satellite connections | New York Times | 14 Jun 2015 |
| Satellite connections | ||
| Earth-to-satellite connections | ||
| Earth-to-satellite transmissions | ||
| Earth-to-satellite connections |