SPECIAL Stat: Charisma
The Radio Room is a special room that help increase the happiness of your dwellers and also allow you to call in new dwellers from the wasteland. The Radio Room periodically sends out a signal. If no dweller heeds the signal, the cycle starts again. Placing dwellers with high Charm stat, merging, and upgrading radio rooms increases the chances of finding a dweller and greatly speeds up the signal cycle.
Upgrade | Room | Upgrade Cost 1 | Upgrade Cost 2* | Upgrade Cost 3** |
LV2 | Radio Station | 1500 | 2250 | 3000 |
LV3 | Broadcast Center | 4000 | 6750 | 9000 |
*Upgrade Cost 2 = Two merged rooms
**Upgrade Cost 3 = Three merged rooms