Insert the pointed end of a spudger under the black antenna cable and slide it as close to the connector as possible.

Gently lift straight up to disconnect the antenna.

The connector is very delicate and can easily break if a quick or strong force is applied.

Repeat the disconnection procedure on the white antenna cable.

To reattach coaxial connectors like these, align the connector over its socket and press down with the flat end of a spudger. The connector should snap into place. This can be tricky and may take a few tries.