Insert the flat end of a spudger under the metal neck of one of the antenna cable's coaxial connectors and lift straight up to disconnect it.

Repeat the process to disconnect the other antenna cable.

To reconnect a cable, hold the metal connector head over its socket and press down with the flat end of a spudger until the connector snaps into place. Don't try to force the connector into place. If you're having trouble, reposition the connector and try again.