[IGS-Equipment-Files] rcvr_ant.tab and antenna.gra file updates

[David Maggert]

Dear Colleagues,

The following item has been added to the rcvr_ant.tab and antenna.gra files.


22 JUN 2021  Added SOKGRX3
                                                 
https://files.igs.org/pub/station/general/rcvr_ant.tab
https://files.igs.org/pub/station/general/antenna.gra


Best Regards,
David Maggert
Network Coordinator
IGS Central Bureau