@renojim
I tried 2 different channels, it had been set to auto. Then I tried Legacy, and N,20Mhz, and then those with a different channel, having the Roku scan after each change. No joy - still never sees my SSID, although it sees plenty of others I don't have passwords for. So now my 2.4G radio is back to where it was.
Another thought - change the SSID! No joy. Just as well, I'd hate to have to reconfigure everything else.
Changed mode from Access Point (WDS) to Access Point. No joy.
Changed Transmit Power from auto to 9dbm (router is 4 ft from Roku) & 30 dbm. Still no joy, so back to auto on the power. Also tried restarting the radio, but only one time. Same with rebooting the Roku. Don't think either of those are necessary after each radio change, as the HP notebook reconnected each time, but the Roku refuses to even see the SSID.
One last thing, tried turning off WMM Mode, and moving the Roku around a bit. Still no joy.
I'm fresh out of ideas. Any more suggestions? I just wish I was getting paid for the time I've put into this today. I could by quite a few Roku Expresses, not that I would now.