code/__DEFINES/radio.dm 
| CHANNEL_STATUS_LISTENING | Used by radios to track how they're interacting with a channel. |
|---|---|
| RADIO_NO_Z_LEVEL_RESTRICTION | give this to can_receive to specify that there is no restriction on what z level this signal is sent to |
Define Details
CHANNEL_STATUS_LISTENING 
Used by radios to track how they're interacting with a channel.
RADIO_NO_Z_LEVEL_RESTRICTION 
give this to can_receive to specify that there is no restriction on what z level this signal is sent to