[Antennas] tuning antennas

[Frederick]

HI

    I have been tuning a quarter wave wire for 80 meters. According to the 
information I obtained with my noise bridge, my 60 foot piece of wire was 
resonant at about 3.4 to 3.5 MHz. I am feeding it with about 7 feet of RG58. 
What I wonder is since the SWR is a product of the total antenna system, how 
many feet of wire will I need to trim from the antenna to make the system 
resonant at the 3.9 4.0 MHz range?
                    God bless,
                    Mark WZ0K
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