David,
Thanks. I found this interesting. As "search terms" any of those words
would give overwhelming results, for sure. As descriptive add ons, I
guess they have a place.
For radios, I suppose a purist would say there is no such thing as an
antique radio (over 100 years old), but that dead horse was beaten
many threads back.

I just did some quick ebay searches:
"collectable": 9,528 items available now
"collectible": 15,741 items available now

I did manage to find:
-- one "collectible unique rare deco" item. A "must have"!
-- 89 "vintage rare deco" pieces, including a cool radio poster, a
microphone, an RCA radio, a Zenith radio
-- "piece crap" yielded a paltry 2 items
-- 389 antique radios or related
-- 588 unique antiques

This is fun! Thanks for the inspiration.

Jim (one of them)