technical help needed

[rayfri]

need some advice.  Whats the formula or method for determining how far
behind a driven element the reflector should go?
I'm building a 20 meter beam.  The driven element will be a shortened
one...
a dipole 102 inches on each side with loading coils on each half of the
dipole at the
feedpoint.  I know that reflectors are usually 5 percent longer than the
driven element, but I need to know the formula or method for figuring
how far behind the
driven element to put a reflector.
Ray  wa7itz

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