So, how to the portals connect to the gateway? I see the description indicates the portal has multiple gigabit Ethernet connections. Does that mean the portals connect via Ethernet (twisted pair)- not via the coax? If so do the portals and gateway support USB Wi-Fi? Basically, I don't have wired Ethernet connections at the TVs so getting a gateway to work without Ethernet or at least via usb Wi-Fi is a must.