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post #1 of 7 Old 05-17-2020, 12:23 PM - Thread Starter
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Antenna cable routing: what sealant to use?

MY plan is to install an antenna in the ground on a 4x4 post, about 3' from the side of my house. The coax would enter a PVC conduit 90 degree elbow at the bottom of the post, then go 3' underground thru PVC conduit, before going straight thru the concrete block foundation. I will use one of those small plastic coax bushings where it enters the block wall. My questions:

1) The top of elbow will probably be above ground. What should I use to seal around the coax cable in the conduit to keep out rain, etc. ?

2) And the same question for the other end of the underground coax before it enters the block wall. Where the coax exits the conduit underground, I assume I should seal the gap between the coax and conduit ?

Thanks for any advice.
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post #2 of 7 Old 05-17-2020, 05:09 PM
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Originally Posted by Jim McC View Post
MY plan is to install an antenna in the ground on a 4x4 post, about 3' from the side of my house. The coax would enter a PVC conduit 90 degree elbow at the bottom of the post, then go 3' underground thru PVC conduit, before going straight thru the concrete block foundation. I will use one of those small plastic coax bushings where it enters the block wall. My questions:

1) The top of elbow will probably be above ground. What should I use to seal around the coax cable in the conduit to keep out rain, etc. ?

2) And the same question for the other end of the underground coax before it enters the block wall. Where the coax exits the conduit underground, I assume I should seal the gap between the coax and conduit ?

Thanks for any advice.

This will work. It is a very sticky putty-like material that can be pushed in place around the cable and will stay flexible:

https://www.summitsource.com/Bishop-...32-P10086.aspx
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post #3 of 7 Old 05-17-2020, 10:46 PM - Thread Starter
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Thanks. Does anyone have advice on finding the wood framing behind my soffit's fascia board ? My stud finder is not working properly, apparently because the fascia is covered by aluminum trim.
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post #4 of 7 Old 05-18-2020, 12:53 PM
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Thanks. Does anyone have advice on finding the wood framing behind my soffit's fascia board ? My stud finder is not working properly, apparently because the fascia is covered by aluminum trim.
I don't know how thick your fascia is, but I've had pretty good luck with a small coin-shaped magnet on a string. Once you find 2 or 3, you can determine the spacing and do pretty well.
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post #5 of 7 Old 05-18-2020, 07:38 PM - Thread Starter
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I don't know how thick your fascia is, but I've had pretty good luck with a small coin-shaped magnet on a string. Once you find 2 or 3, you can determine the spacing and do pretty well.
Thanks. So you're method is to find the nails thru the fascia board into the framing members behind it ? The fascia board is 3/4" thick. My house is a ranch built in 1975. Would the framing behind the fascia more likely be 16" or 24" apart ?
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post #6 of 7 Old 05-19-2020, 07:24 AM
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Thanks. So you're method is to find the nails thru the fascia board into the framing members behind it ? The fascia board is 3/4" thick. My house is a ranch built in 1975. Would the framing behind the fascia more likely be 16" or 24" apart ?
Yes, find the nails. As to 16" or 24", yes https://www.avsforum.com/forum/images/smilies/smile.gif.

As to which, no way to know. Here in the southeast, 16" 2x4 was almost all of individual home construction then. The only place I saw (from the street, I'm not a builder) 24" anything was ceiling joists and rafters. Today is different with 2x6 used for thicker insulation sometimes ... but spray foam gets those insulation levels in 2x4 construction.
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post #7 of 7 Old 05-19-2020, 02:51 PM - Thread Starter
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Thanks. I will see what I can figure out. If I have to, I can remove one of the aluminum trim pieces and reinstall it. The problem I see is only one of the 12" standoff bracket holes will be able to be screwed into the framing.
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