stryped wrote in
:

I had a dish network sat dish and outside over the air tv
antenna mounted to a tower until a storm blew through recently
and blew the tower over. The person that installed the dish
installed a coax grounding block near the point of entrance of
the coax into the house. Both the over the air coax as well as
the sat coax were connected to this block. A ground wire ran
from this block about 12 inches to a power cut off box for my
outside ac condenser. (Is this legal/proper?)

Yes; in fact, it's required by the National Electrical Code.

Anyway, I never had any problems out of the system. Years ago I
had a ground rod at the tower and had nothing but problems with
lightening strikes. When the person grounded it to the ac unit
thus connecting it to house ground, I never had a problem.

The sat was re installed near its original location except to
the eave of the house. I have been thinking of installing my new
antenna and rotor on my vinyl chimney. Currently the chimney is
not used, I don't even have gas logs although some day I might.

I guess my question is, can I install this set up on my chimney,
running my new coax down the side of the house to a new
grounding coax block, then running a ground wire from the coax
block into the crawlspace to a junction box that is already in
the crawlspace? (Thus grounding the coax to the house ground).

Why would you not use the same ground you've been using, at the A/C unit?

Also, I noticed that even before, the installer grounded my coax
for both the tv antenna and the sat dish but the masts for each
were not connected to any ground. Should they be?

Yes.