Which sending stations should be blacklisted from being digipeated or I-gated by this
station. Normally, you should not need to use this. However, because the licensee of a station
is legally responsible for the transmissions of that station, this gives you the ability to
prevent re-transmitting other stations that you have determined would cause you to be in violation.
Initially, the blacklist is empty. You can type in a callsign-SSID combination and click the
Add Callsign button to mark that station for blocking. Similarly, if you determine that the station
should no longer be blacklisted, you can select it on the list and click Delete Callsign to
remove it from the blacklist.