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Old 06-18-2016, 03:33 PM   #41
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Well, any antenna becomes a target for lightning, and they will usually have multiple ground rods at the base of the antenna. I had a ham radio setup that had a 38' antenna in my backyard which had several ground rods and was tied via buried jumpers and more ground rods to my service panel ground. I also had my equipment which was connected to the panel via more jumpers and rods and lightning arrestors. It was a pain to install due to the distances between the panel ground, the antenna, and the equipment and dealing with heavy gage copper wire.

Also, for home service grounds, the electrician should really do a conductivity test to see if the soil is sufficient, although I doubt that most of them do that.
Just a guess. I would expect your connection to ground rods and jumpers are not a safety ground, but a ground that is part of the antenna radiation structure... like a quarter wave above a ground plane. The grounds connected to the panel with arrestors etc are for lightning protection... not part of the antenna design.
There are antennas that do not require a ground structure to radiate such as a yagi or loop antenna. These
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Is it impossible to run a ground wire from the antenna to a ground rod below and then connect that to your service panel ground?
It is common to run a safety ground a ground below a TV antenna. Often then the ground and signal need to be run to the service point of the house and grounded there to the single point (input ground) for both the antenna and signal cable. Everyone talks about heavy cable or wire. Not just the weight of the cable, the low inductance is important.

All this protects the ground, but the signal (center conductor of the coax) is not really protected by this. A properly grounded gas discharge tube can protect (at least partially) the signal line (center conductor) of the coax.
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Old 06-18-2016, 04:16 PM   #42
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I would still think a separate ground rod, even far away and un-coupled, would be better than nothing?

-ERD50
Agree, there are certainly situation that make ideal grounding very difficult, you just do the best you can.
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Old 06-18-2016, 04:35 PM   #43
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Just a guess. I would expect your connection to ground rods and jumpers are not a safety ground, but a ground that is part of the antenna radiation structure... like a quarter wave above a ground plane. The grounds connected to the panel with arrestors etc are for lightning protection... not part of the antenna design.
There are antennas that do not require a ground structure to radiate such as a yagi or loop antenna. These

It is common to run a safety ground a ground below a TV antenna. Often then the ground and signal need to be run to the service point of the house and grounded there to the single point (input ground) for both the antenna and signal cable. Everyone talks about heavy cable or wire. Not just the weight of the cable, the low inductance is important.

All this protects the ground, but the signal (center conductor of the coax) is not really protected by this. A properly grounded gas discharge tube can protect (at least partially) the signal line (center conductor) of the coax.
Yes, there are several concerns to deal with in terms of grounding: lightning protection, safety and RF. You certainly don't want to make it easy for lightning to come inside vs going to the ground. The ground rods for the antenna and shack are all connected by jumpers, and the antenna also had many radial ground plane wires, these are also connected to the service panels ground rod via jumpers and a few more rods. ICE protectors were mounted on a copper sheet inside the shack that was then bonded to the ground rod system, and I relied on the ICE protectors vs disconnecting the coax when not in use. All equipment was also grounded via a bus to the copper sheet.
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