The airspace around KSAT has a lot of military traffic. Occasionally you'll get some F-16s do some low approaches into the airport but usually their comms aren't scanned.
Northeast of the airport is Randolph AFB, T-6A Texan II, T-38C Talon, T-1A Jayhawk and the T-43A all fly out of there.
To the Southwest is Lackland AFB they usually get a lot of C-5 and KC-135 traffic, and if you're lucky you MAY catch a Boeing 787 flying in from Seattle.