Go to the schedule, and scroll down to today's game. There is a "listen" option you can select. Not sure if you have to download an app for it to work on your phone.
It also lists: Radio: 1620 AM/94.5 FM, TAMU Sports Network
Somewhere on 12thman.com it should show you the various radio stations that compose the TAMU Sports Network, if the two stations listed are not in range for you.