How am I supposed to use the Radio Room?

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My vault has a Radio Room 3 rooms wide fully upgraded. I have 5 people in the room with relatively high Charisma. Yet it seems every session I run I get nobody to the vault using the radio. It seems like I get at most 1 person every 5 days or so of playing this, and I'm not sure how I'm supposed to use the Radio room to get more dwellers in my Vault.
Is the process of acquiring dwellers from outside normally this slow, or is their a better way I'm supposed to use the Radio Room?
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How do you use the radio room in fallout shelter?
The Radio Studio room requires you have 20 Dwellers in your Vault before it can be unlocked. Radio rooms attract new Dwellers and improve the happiness in your Vault. Assign Dwellers here to attract more Dwellers to your Vault from The Wasteland....Radio Studio.Room NameRadio StudioResourceDwellersRoom SPECIALCharisma2 more rows•Jun 14, 2015How does the broadcast center work fallout shelter?
Overview. The radio station transmits a broadcast into the wasteland in order to attract new dwellers. If the room is poorly managed, however, it may do nothing at all, or attract raiders and deathclaws. Its overall effectiveness is based on the assigned dwellers' Charisma.Can you get legendary dwellers from radio?
Use The Radio Station. The Radio Station is a great way to convince people to live in your Vault, as its broadcasts attract survivors from the Wasteland. Usually, the Radio Station will lure in a common or rare dweller, but on occasion, you'll get someone Legendary.What does the timer on the radio station mean fallout shelter?
The radio room is different. Each time it completes its cycle, it has a chance to attact a single new dweller. If it fails that chance, it immediately starts a new cycle, whether you have the vault open or not. It repeats this cycle until it successfully attacts a dweller.[*/\\*] Fallout Shelter - RADIO STATION
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