Reg, G4FGQ wrote:
"The angle of the "horizontal" dipole relative to the horizon, whether
it is an inverted V or not, makes negligible difference to the amount of
noise it collects."

It could be taken to the extreme. Rotated 90-degrees, the horizontal
wire becomes a vertical wire. On its way to becoming a vertical wire, it
is a sloping wire. The sloping wire responds with a vertical component
in addition to its horizontal component. The sum of these components
make up the wire`s total response.

To the best of my knowledge, Reg hit the nail squarely on the head in
the rest of his posting about noise radiation and reception.

Best regards, Richard Harrison, KB5WZI