computer -->acrossHouse--> hi-fi? (Boss says "SEE NO WIRES!")
(Why the effort: hi-fi has vintage-1969 BOSE 901 incredible-sounding speakers, backed against old-house HARD plaster wall (ideal/required for the 901's audio backwards-reflection scheme).
Method 1: Buy cheap computer for hi-fi AND HOPE wifi reaches (6 plaster wall-faces; see below).
(Yes, wifi, transmitted from kitchen computer-site, does nicely reach laptop in basement, but that path is through only ONE wall and one wooden floor.)
Method 2: Hang cable from ceilings: kitchen (where PC is), across front hall, living room, and into where hi-fi is. (GUARANTEED RESULT: end up living on the street or in the car!)
Method 3: Hire electrician to run cable out kitchen window, around back of house, & into hi-fi's window.
Method 4: MY DESIRED IDEAL: (wireless scheme) Concoct scheme to transmit wireless signal from computer, received at hi-fi amp.
Distance: 13 yards;
Impediments to wireless transmission: must go through three OLD 1945 HOUSE walls, each surfaced with heavy plaster, probably backed with wire mesh, thus 3 * 2 = 6 layers of it (ie one layer on each wall face).
Question: how to implement such a solution -- and at a reasonable cost?