I should make one important Addendum.
 
A QUARTER WAVE antenna will ACT like a HALF WAVE.... IF.....
 
IF....  There is a PLANE in apparent Opposisition to the Radiator..
 
That is.. 
 
IF...  you have a GROUND PLANE that is equal or larger than the Quarter length.
Radiation will "See" that as a continuation of the HALF WAVE..
 
So it is likely that in Marine installations...  A ground PLANE  ( NOTE A "Plane")
Is made to act as part of the system..
 
Often the Backstay and a Ground Plane is the Antenna on a vessel..
 
So the Radiator can be ONE QUARTER WAVE LENGTH..
 
How one accomplishes that GROUND PLANE.. is a subject that makes for a lot of anger and Heated discussion..
 
It's a lot more complicated than just ..  Tying to the Backstay and the BONDING strap of a boat..
 
At least .. In My Humble Opinion...
 
ralph

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