I was helping someone with getting their wifi printer setup. This is an HP Deskjet. They are on AT&T Uverse and I knew from a prior case that the HPNA can interfere. So I turned off HPNA in their Gateway (Modem) and got the printer to appear on the network. But then it turned out this was keeping one of their TV's from working correctly. So AT&T turned HPNA back on.

My first question is, if we leave HPNA on at the AT&T Gateway, but hang a separate third party WiFi Router off the Gateway (would probably set it up as a Wireless Access Point only), and had that new router handles all WiFi on the network, would this eliminate the interference that the HP Printer is seeing from the HPNA signal?

Secondly, if the above is not true, what other configurations can you recommend?