Many thanks, cbgrizzle.
I appreciate your sharing your experiences with the Miccus, as well as the tip regarding a WIFI router, repeater, or mesh network(s) proximity to the X-mitter.
It's a learning experience, for sure. Most of these devices come listed as receivers. Then, after reading their tech stuff, you learn that the same device is also a transmitter. Some have a switch you flip, while others do not. Some will give you stereo sound, using two speakers for the usual placement, and others are only mono.
I like antennae and I also like two RCA Phono Jacks versus using the 'Y' or adapter, though.
These devices are obscure in the sense that you glean a little more knowledge each time you visit a different brand. Speaking of brands...
Different search criteria yield entirely different brands - some of which, despite much searching, never appeared before.
Crutchfield has been most helpful. Did you know that in addition to the mainstream Miccus and Audioengine, Cambridge Audio, Harmon Kardon, Trond, Etekcity, Avantree, Aluratek, and Soundcast make one or more? There are brands from England, too. Auris Blume is yet another one that I just found among my stack of notes.