| Some distances of important human radio broadcasts | |||||
|---|---|---|---|---|---|
| Event | Date | Frequency (MHz) | Distance (ly) | # of Systems | Notes |
| Marconi Broadcast | May 13, 1897 05/1897 | 0.50 | 433 | Morse Code | |
| Fessenden | Dec 24, 1906 12/1906 | 0.08 | 387 | First Voice | |
| BBC predecessor | Jun 15, 1920 06/1920 | 0.50 | 332 | ||
| First FM Station | Jul 18, 1939 07/1939 | 50.00 | 252 | ||
| FM frequency increase | Jan 1, 1945 01/1945 | 108.00 | 237 | ||
| Sputnik satellite | Oct 4, 1957 10/1957 | 40.00 | 186 | Beeps | |
| SCORE satellite | Dec 19, 1958 12/1958 | 132.00 | 179 | Voice broadcast | |
| Telstar | Jul 10, 1962 07/1962 | 4000.00 | 165 | ||
| Intelsat (Early Bird) | Apr 6, 1965 04/1965 | 6390.00 | 163 | ||
| First Star Trek Episode | Sep 6, 1966 09/1966 | 470.00 | 150 | Seek out new... | |
| System numbers updated 5/24/2025. | |||||