SkyRoof gets transmitter frequencies from the SatNOGS database. This database currently lists 2 transmitters for Ossie, 2.2 GHz and 401 MHz. If you know of another transmitter, submit your information to SatNOGS (requires creating a free account).
https://db.satnogs.org/satellite/GPTJ-0695-8904-2842-6953#transmitters
If you know of another transmitter, submit your information to SatNOGS (requires creating a free account). See
How can I add a satellite that is currently not listed in SkyRoof? in
F.A.Q. for details.