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How to Ground an Outdoor TV Antenna

How to Ground an Outdoor TV Antenna

Updated On June 29, 2021

While purchasing a TV antenna, not many people are aware that it needs to be grounded. Even the newer ones that have metal inside them. Since TV signals are essentially made of electricity, the antenna is engineered to capture that. If you have not grounded your antenna, it will also attract lightning, significantly damaging your house. 

While the chance of that happening may be slim, it definitely isn’t worth taking a chance over. There are also some jurisdictions that make this mandatory. 

Let’s see how we can ground an outdoor TV antenna, but before that, you may see guides here for the best outdoor TV antenna for rural areas.
antenna grounding
National Electric Code (NEC) Article 810 dictates the compliances on grounding procedures, and the usage of materials needed for the same are aptly demonstrated in the picture. (1)

For the safety of the house, single-point grounding is advised so that all surges flow in one direction towards one point, to the ground. It needs to be connected to a point located near an electric service meter panel called Power Service Grounding Electrode System. 

The images show two wires, merging into one at the Power Service Grounding Electrode System, from the antenna:

  • One is connected to the coaxial antenna cable. 
  • Another one is attached to the pole or mast on which the antenna is mounted.  The meeting point is a metal rod that has been buried underground to divert and control electrical surges.
1. House Ground Wire
Usually, it is available as a single wire connected from your electric service meter panel, going straight down into the ground. Easy to identify, it is quite a thick copper wire attached to the metal rod that will ultimately be buried. 

Ensure beforehand that it is not rusted as the acidity from the soil can eat away at the metal. Note its location carefully. In case of any damage, you will need to call the electrician right away to get it fixed.
2. Mast Clamp
mast clamp
You can do away with either a ground strap or a pipe clamp. The device is needed for bonding a house wire to the antenna’s mast. It looks something like this:

If the place where the wire is supposed to make contact with the mast is coated or painted, chip it off so that wire is directly connected with the mount. 
3. Grounding Wires - Quantity 2
Get two copper wires that are a little less thick than your house ground wire. An ideal thickness of at least #10 American Wire Gauge is recommended. These will be used to ground the antenna coaxial cable and mast. There are some brands that also offer wires with grounding qualities.
4. Coaxial Grounding Block
coaxial grounding block
A coaxial grounding block is specifically used to ground coaxial antenna cable. The same is depicted through the descriptive image by NEC. Majorly, you can find two types of grounding blocks:

Standard: Widely available in the market, it looks something like:
You can find this near the coaxial cable where it enters the home. It helps dissipate interference and static, without disturbing the signals.

Coaxial Lightning Arrestor: If you live in a zone with a lot of thunder warnings and experience lightning strikes fairly frequently, then you will be better off with this one instead of purchasing the standard one. It is more sophisticatedly designed in the way that it is filled with a gas that instantly gets ionized by sudden electronic surges and directs the spike directly to the ground. 
coaxial lightning arrestor
5. Sufficient Coaxial Cable
During the installation of the coax grounding block, you will be needing the two parts of coaxial cable. Ensure that you have enough.
6. Ground Clamps
ground clamps
These ground clamps are needed when you will attach the coax cable and the mast to the ground wire. It looks like the spike bolts her:

However, please be careful that the house wire should not be detached to attach these bolts as it could be unsafe. Try using an Intersystem Bonding Termination Bar (ITSB) instead. 

Method for Grounding an Outdoor TV Antenna

Let’s get the complicated task of grounding the TV antenna mast and coaxial cable:
  1. First, identifying the place where the coaxial will enter the house. Ideally, it should be a site where it remains sheltered from the rain, but is on the exterior of your home. 
  2. Now, affixing the block to the wall. Since, usually the blocks come with screws, it will easily allow you to install it directly.
  3. Now attach the antenna cable to the block. Ensure that it is of proper length and try to go for a more weatherproof option.
  4. Attach another cable from the block to the TV set.
  5. Finally, attach the grounding wire to the house ground wire and the block.
antenna grounding material
Now, on to grounding a TV antenna mast:
  1. Start by attaching a grounding wire to the antenna mast. If you have chosen a mast clamp, attach everything securely so that nothing slips off. If you are not using the clamp, and are attaching the wire directly to the antenna mount, ensure that there is direct contact and no paint or coating is coming in the way.
  2. Finally, start running the grounding wire from the TV antenna mast to the house ground wire. 

Here, you can check the learning guide as well on how to connect outdoor antenna to multiple TV.

Final Words

Usually, people have the question of whether indoor antennas need to be grounded, too, if they are not at risk of attracting lightning. While that is true, there are some benefits to grounding an indoor antenna. Grounding helps get rid of interference and static. The connection and signals will be clearer. It also prevents you from getting a probable electric shock. Since the antenna is connected to a converter box and TV, at some point in time, it can have leakage. All the excess current will now be directed to the ground.

It should be remembered that the foremost advantage of grounding any antenna is safety. So, you should not take it lightly or do a shoddy job. It needs to be airtight. If you cannot follow the instructions and are not confident about the task, please consider hiring an electrician or a professional.

It is also good to be aware of the laws in this department. You can also check the learning guide here on how to get better TV reception with outdoor antenna! Until our next article!
References
(1) NEC - https://searchdatacenter.techtarget.com/definition/National-Electrical-Code-NEC

About the author 

John Temple


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