Take 2 rods and grind a point on each rod. Point the points toward each other. 
There is your spark gap.

You can do the dame thing with copper flat stock used on building grounds in 
electrical valts.
 
Stay on course, fight a good fight, and keep the faith. Jim K9TF/WA9YSD
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UR RST IS ... ... ..9 QSB QSB - hw? BK

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