Vehicle & Technical > Discovery

Roof bars. will they conduct electricity?

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muddyjames:
I have bought a cb radio and hope to mount the aerial onto the roof bars, you know the ones. they go front to back on both sides of the disco and the other pieces clip into them.

I am hoping that they will be a good earth for the aerial. I am guessing they are bolted onto the disco as you can rock the car and they stay put! So in theory they should be ok.

TimM:
Hmmmm, not sure.

I have a feeling they are Aluminium, and I have visions of seeing some sort of padding between the roof and the bar.

Why do you want to mount it there?

thermidorthelobster:
I think they're steel bars with ally end mouldings, but that's not really relevant as both steel and ally conduct electricity very well of course.

The question is how they bolt through.  There is foam padding between the ally pieces and the roof, but I imagine the bolts which hold them to the roof are not insulated from the roof.  But I've never taken the head lining out, so I'm not sure.

Stick a multimeter on and you'll find out pretty quickly.

TimM:

--- Quote from: "thermidorthelobster" ---I think they're steel bars with ally end mouldings, but that's not really relevant as both steel and ally conduct electricity very well of course.
--- End quote ---


That sounds about right, but I thought Aluminium wasn't a very good groundplane (for the CB).

I could be wrong though  :?

muddyjames:

--- Quote from: "TimM" ---

Why do you want to mount it there?
--- End quote ---


Coz I bought a quickly removeable aerial holder as I want to take the whole cb radio indoors when not in use or put it into another car if needs to be. I dont want the aerial on show as light fingers may want to pinch it and or break in and steel anything elseinside they like the look of.

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