Do what Bizman suggested. Run an Ethernet cable to the router. Much better connect, and secure.
Also, I tried a power line adapter from netgear.......it is okay, but the Ethernet cable is the best all the way around.

What I did was install a brand new, dedicated DSL phone line attached to the telephone company interface box. This new line is one quarter the length of the old line. The modem is now four feet from the computer is tied to the computer by the ethernet cable. So it was a win-win installation.
I had a good wireless setup so game play is only somewhat better. As Skuzzy noted though, the biggest gain is in clarity of the Voice.