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Getting an FM roof ANT ground

Discussion in 'Archived Threads 2001-2004' started by Bill Kane, Dec 5, 2001.

  1. Bill Kane

    Bill Kane Screenwriter

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    I've read in these forums that not all grounds are created equal -- with a caveat about avoiding unequal potentials.

    I attached a Fanfare FM whip to my roof eave; it comes w/RG59/U cable, and I put a "static discharge" unit in the run at the mount base. Fanfare says just run a grd wire to a ground stake but I'm not sure if this is sufficient. I don't trust my nearby coldwater hosebib for a ground because the house main service panel (on the far side of the house from this antenna) is grounded to the natural gas meter pipe!

    At City Hall, a bldg inspector suggests running a 10AVG ground from the ANT block to the ground terminal at the rear of my AVR. I still have not run the ant wire into the house.

    Do I have any real concerns about running afoul of "offset ground potentials"?
     
  2. Wayne A. Pflughaupt

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    Wayne
    Do you mean he said to run the ground from your antenna to your receiver?? I sure wouldn’t do that. You need to run the ground to the place where the house electrical grounds. If you ground it somewhere else, you have a potential ground loop, which = hum.

    Can you install the antenna in the attic? Then you wouldn’t have to worry about a ground.

    Happy Holidays,

    Wayne A. Pflughaupt
     
  3. Bill Kane

    Bill Kane Screenwriter

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    thanks, wayne, I hoped you'd check this one out.

    Yes, I guess I'll relocate the antenna so I can run a ground down to the gas utility pipe.

    I prefer the whip higher on the roof, outside, since I live in a valley.
     
  4. Chuck_C

    Chuck_C Stunt Coordinator

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    Bill -

    If you are mounting an antenna on the roof, I would definitely not bring the ground wire inside the house. Run a large Ga. aluminum ground wire down the outside of your house to a good ground rod. Try to use a one-piece (unspliced) ground wire. This will help draw off any electrical potentials and if you do get a lightning strike, it will keep it outside the house.

    Lightning can do some strange things. It once blew a hole in my roof and nailed a phone line that was strung through my attic. So, putting an antenna in an attic is no guarantee of it not getting hit by lightning.
     

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