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Snapped Super Magnum Antenna

Alexis Mercado

Well-Known Member
May 17, 2016
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Hi guys. I have a Antenna Specialist Super Magnum base antenna. It broke the insulator
( brown part , I don’t have any idea what type of material is made of ) where the enameled wire which forms the coiling go.

I would like to repair it since it is a classic antenna. See pic.
 

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Here is another picture
 

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Hello Alexis: Yes those Super Mag Antennas break there as your photos show. That was/is a common problem with those antennas. I had one and it broke in the same place. The part that broke is a insulator, and can be replaced with a solid piece of Fiberglass Rod. See Max Gain at:

https://mgs4u.com/?v=7516fd43adaa

Jay in the Great Mojave Desert.... "Next gas 150 Miles"
 
I thinks this part is made of phenolic. It’s has a inside diameter of 1/2” , an outside diameter of 7/8” and a wall thickness of 3/16.

I’ve read that phenolic is a high isolating material. Not sure if it’s stronger than fiberglass.
 

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I’ve read that phenolic is a high isolating material. Not sure if it’s stronger than fiberglass.

Well, neither. Fiberglass is usually just the reinforcing material in a type plastic, often epoxy or polyester resin. Phenolic is another type of resin.

Most things we think of as being made of "fiberglass", aren't made of fiberglass but fiberglass-reinforced plastic.
 
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I thinks this part is made of phenolic. It’s has a inside diameter of 1/2” , an outside diameter of 7/8” and a wall thickness of 3/16.

I’ve read that phenolic is a high isolating material. Not sure if it’s stronger than fiberglass.
 

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carbon & graphite tubes are no good as rf insulators,

teflon/ptfe is very good but far too weak & soft,

delrin / acetal is ok but not very strong

fiberglass/grp comes in several flavours, unidirectional acrylics & polyester been the weakest & cheapest, spiral wound epoxy fiberglass been more expensive & stronger,

phenolics & epoxy laminates come in may flavoures, usually paper or cloth or woven glass laminates in various resins,
some have very good mechanical & insulation properties,

they use tufnol laminate as spreaders for overhead high voltage power lines
 
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