Replacing my Actiontec (need both ethernet and coax??)

I want to replace my Actiontec with a DD-WRT router and here is my dilemma. My data source is Ethernet but the Coax connection on my Actiontec is also used to communicate with all my STB's. Therefore I don't see how I can completely replace my Actiontec since that coax connection seems to be a necessity. Here is a screenshot of my network connections.