There's no special configuration of the Actiontec needed to use WDS if the secondary router supports it.
Be aware that your wireless speeds will be halved. The WDS router has to receive on one channel, then turn around and transmit on a second channel, taking twice as much time.
In you situation, I would suggest using a MOCA bridge
instead. Connect the MOCA bridge to the coax in the basement and then connect your secondary router to the MOCA bridge.--
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