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Standard User DanielCoffey67
(regular) Tue 24-Sep-19 21:44:38
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Lightning precautions on rooftop antenna?


[link to this post]
 
Are there any devices or precautions I should bear in mind if asking a professional installer to fit a roof mounted pole for a 4G antenna?

I am thinking of a 2-3m pole with a pair of yagi-type antennas, 1m coax cables terminated in Type-N connectors to an outdoor modem/router that then runs down the side of the house over Cat5 to my PoE switch.

The building is a bungalow with much taller trees nearby and one taller property within 50m
Standard User Brunel
(experienced) Wed 25-Sep-19 10:45:41
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Re: Lightning precautions on rooftop antenna?


[re: DanielCoffey67] [link to this post]
 
Almost impossible to protect against a direct strike. All you can do is make sure the installation is well and truly connected to an earthing point. A substancial earth rod and very thick cable.
Administrator MrSaffron
(staff) Wed 25-Sep-19 11:13:36
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Re: Lightning precautions on rooftop antenna?


[re: Brunel] [link to this post]
 
Don't ever recall seeing lightning protection on tv aerial installs which are usually above roofline

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.


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Standard User sheephouse
(member) Wed 25-Sep-19 12:35:09
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Re: Lightning precautions on rooftop antenna?


[re: MrSaffron] [link to this post]
 
We once had a direct hit on our TV arial - just blobs of aluminium alloy all over the garden and a bare pole on the chimney stack, coax cable burnt through in several places, and a dead computer that was on the other side of the wall where the coax ran down.
Standard User R0NSKI
(knowledge is power) Wed 25-Sep-19 15:53:02
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Re: Lightning precautions on rooftop antenna?


[re: DanielCoffey67] [link to this post]
 
Surely a suitable lightning strike system offering very low resistance to earth is the way to, which means the lightning is more likely to hit that than your antenna

Standard User jabuzzard
(committed) Wed 25-Sep-19 16:00:11
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Re: Lightning precautions on rooftop antenna?


[re: sheephouse] [link to this post]
 
You can also end up with your house on fire, holes in the roof, plaster blown off the wall where the lightning strike used the house wiring as a path to earth, the list goes on.

You would need proper lightning protection, aka a thick piece of copper to the ground and proper grounding. This will be expensive. Even with all this a nearby strike can still take everything out with raised ground potentials. The lightning strike for a brief moment raises the ground potential near the strike many thousands of volts, which can raise the earth potential in the house and electricity from the strike starts flowing in the wrong direction...

Frankly in the UK the main solution is insurance as we don't get sufficient lightning to make it an issue unless you have a tall building.
Standard User jchamier
(eat-sleep-adslguide) Wed 25-Sep-19 16:12:46
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Re: Lightning precautions on rooftop antenna?


[re: jabuzzard] [link to this post]
 
In reply to a post by jabuzzard:
Frankly in the UK the main solution is insurance as we don't get sufficient lightning to make it an issue unless you have a tall building.

+1 as seen on church spire's.

plusnet 80/20 (2/jun/14) at 470m; high sync history: 64/9 (Sep/17), 54/6 (Jan/19), 51/6 (Mar/19), 47/6 (Aug/19)
20 years of broadband from 1999's ntl:cable modem trial - Live BQM
Standard User sheephouse
(member) Thu 26-Sep-19 09:39:44
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Re: Lightning precautions on rooftop antenna?


[re: jchamier] [link to this post]
 
As the Vogons say "Resistance is useless".
Standard User jabuzzard
(committed) Thu 26-Sep-19 10:51:01
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Re: Lightning precautions on rooftop antenna?


[re: sheephouse] [link to this post]
 
I thought that was the Borg.
Standard User mking90031
(regular) Thu 26-Sep-19 11:07:59
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Re: Lightning precautions on rooftop antenna?


[re: jabuzzard] [link to this post]
 
In reply to a post by jabuzzard:
I thought that was the Borg.


Hi,

The Borg was "Resistance is futile" not useless......Direct quote is "Your biological & technological distinctiveness will be added to our own. Resistance is futile."

Yours,

Mark King MCP
www.mark-king-basingstoke.co.uk
Virginmedia 541.32Mb/sec Down & 37.37Mb/sec Up (according to Speedtest.net W7 App)
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