Thanks Ira,
I have ATT Uverse ARris combo modem/ router.
Before I bought, I called D-Link and they said it works but I've gotten up ok, I've tested this many times and dont see any benefit from the extender to the original router/modem connection.

With Netgear I could never even get to the stage of the extender working.

Two other questions:

1) I do speed test to verify,

https://www.speakeasy.net/speedtest/


and it may say 5mbs and then next immediate try, a few seconds later say 10 mbs, and next try 18 mbs... I don't see any consistency with that.

2) Sometimes when I have the worst freeze up with websites, Video halts, I do a speed test, and sometimes it will say 1 mbs, which makes sense, but sometimes it will say 19 mbs which is the max! what is that all about?