Can I have TV service from both coaxial cable and 1GB WiFi?

I am subscribing to Xfinity 1GB WiFi and TV Core services.  I recently found that my home's coaxial network in good shape. At present, a coaxial cable is connected to the gateway router. My Samsung TV receives wireless signals from an Xi6-T box (Model TX061AEI) which also serves as DVR. Because the TV picture quality fluctuates at times, I wonder if I can ask Xfinity to connect the coaxial cable network to my TV and an XG1v4 box?