Jim:

Read the Low Voltage Handbook and more of this now makes complete sense.

My plan is to run a #10 insulated copper wire from the main ground
location in the electrical room at the end of my building out and up and
then horizontally along the outside brick wall at about the height of
the mount for my antenna.

From what you are saying, that single #10 lead can be bonded to the
short (probably 24" or less) piece of mast pipe that runs between the
two 12" wall mounts up to the base of the 40" X 2" wifi antenna AND to
the ground lug on the gas discharge that is screwed into the connector
at the base of the antenna mount (inline to the coax cable).

Do I have this correct?

Actually, there will be only a very short piece of #10 from the mast
to the discharge unit. Does it matter which one I connect to first prior
to looping over to the other?

Jim Lux wrote:

Do I need to provide one ground for the mounting pipe (mast) that
secures the base of the antenna (the aluminum sleeve that contains the
connector at the base) to the brick wall and a second ground to the
grounding lug on the inline gas discharge unit?


Not necessarily. You can daisy chain to a certain extent, but you
should consider the implications for your overvoltage protection. Too
much running hither and yon will increase the inductance of the
grounding line, and depending on what your equipment is grounded to,
that can actually make things worse. (i.e. if your internal equipment is
grounded to the "green wire ground" in the wall receptacle, and the
transient suppressor is grounded to a different wire following a
different path, then you can have pretty big voltages between the two.)