However, it may not be legal (i.e. according to "code") and therefore
would invalidate your home owner's insurance, etc.

AFAIK in the US, all grounds must be bonded together.

Geoff.

Thanks everyone for the helpful tips.

Geoff, when you say that the grounds must be bonded, do you mean that
the ground rod I install just outside my shack has to be connected to
my home's electrical grounding system? Would I simply run a wire
between the two grounds?

The problem with this is that it's quite a long run to the electrical
ground, and I'm guessing that the connecting ground wire would pick up
a lot of noise. Is this a justified concern?

Thanks