Well, the little F-connector screw-on-to-push-on adaptor arrived today (actually a pack of ten). I had set the T-S500 in the system with the cheesy, thin, straight-wire, comes-with antenna attached and all stations were noisy, as I expected. Connected the simple dipole I cobbled from 3/8" copper tubing, which I use in the vertical orientation, and now everything comes in clean with no background noise.
Having tried rabbit ears, folded dipoles, and lengths of twin-lead previously - which improved reception but with some noise still on most stations, I have to say that I am delighted to have found a simple solution with the thick copper tubing. The antenna is almost five feet long, standing on end behind the tall cabinet, out of sight. Two lengths of 28.75" tubing tunes the antenna for 98Mhz. Middle of the band, near enough.
The Yamaha tuner looks good with the A-S500 integrated amp, and works via the amp's remote. Yay. The amp I had found was black, so they match. Haven't had a tuner match an integrated since, well, maybe about 1979 (Pioneer). Yeah, I think that is correct, although I may have had an NAD pair in the 80s when a lot of gear was going in and out of the house regularly. Anyway, it looks nice, sounds great, and I only have about $360 total in the two pieces, driving the Klipsch Fortes.
So the modest, modern Yamaha tuner does the job quite well. Glad to have picked it up cheap via Amazon Warehouse. And now you know the rest of the story.