Roger,
I wish I had that kinda problem (LOL). I think I'd
have to give the shunt feeding a try. All the antennas
hanging on the tower should act as capacitive hats (might
try with them both shorted and not shorted, see what the
difference is). As for the house wiring, who knows till
you try it? The part that would stop me would be the trips
up the tower...
'Doc

PS - Former owner of the second most costly Ercoupe in
the world, N415E. Don't ask.