The antenna change over relay alone is one of the major offenders. It really makes quite a loud snap when it engages.
Same here. I once used a Dow-Key relay, but the Gates burnt it to a solid block of charcoal before I addressed the relay sequencing problem. So I pulled out this buzzardly pre-WWII antenna change-over relay I picked up at a hamfest probably decades ago, n.o.s., still in the original box. The coil is 110V, and the thing is constructed like a transformer core. Engages with a clank, plus the coil buzzes from the a.c. It worked well, with plenty of margin, but the noise was unbearable.
I fixed it by mounting it inside a hinged wooden box I had on hand, and mounting the whole thing on the wall. The relay is suspended on springs, and the springs are fixed to the box using rubber grommets. When the door is closed, the buzzing is inaudible, and the "clank" is reduced to a benign "thump" that is barely audible at the operating position.