[Antennas] Building A Coil

[Mark]

Hi
     I have an idea on how to improve my mobile antenna that I am using on a 
portable tripod. I need some help to make my idea come to life however. My 
antenna is a 75 meter mobile and it presumably acts as an end fed quarter 
wave. I am looking for a coil that I could mount between the feed point of 
the antenna and the mount. It would need the appropriate 3/8 threaded 
adapters at each end. This coil needs to act as a quarter wave resonator. 
This will bring the antenna to a total of a half wave. Does any one know if 
such a coil is made on the market or if there is some one I could higher to 
build one like this?
     Thank you for your help.

God bless,
Mark
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