P.S., to all the good folks here, please narrow/tweak your recommendations if possible to wireless solutions only. I have no easy way or desire to run a cable from my router to my streamer or use powerline - I understand this may be presenting a tradeoff but it is a hard limitation. I may have not stated this explicitly enough in my original post, and for that I apologize.
In system engineering this is called "optimization under constraints". :-)
Thanks!