If you have an imbalance current trying to find its way to ground,
it'll
take the path of least resistance (technically, impedance). If that
path
is the mains wiring, you have a lot of potential for RFI. If you can
convince some of that current to go elsewhere by "grounding" your
station, you're likely to cut down the RFI. But a better solution is to
get those feedline currents balanced so you won't have any imbalance or
"ground" current to deal with in the first place. It brings the added
benefit of putting the power into your antenna to be radiated rather
than being radiated from the conductors carrying the imbalance current.


Exactly. This is why I call the "grounding" method a bandaid.
I think the 2nd solution is the best route to go. And if you use
the 2nd solution, the length of the line, and the location or height
above ground will not matter. And no worrying about getting a
good rf ground, which is hard to do in many remote locations of
a building.
MK