[SECC] ARRL 160 - KU8E

[K4SAV]

ku8e at bellsouth.net wrote:

>I got it resonant on Saturday during the day around 1835 but when I added the extra 40 feet of feedline from my antenna switch to the shack it was resonant around 1750 again. ....
>

If your feedline changes the resonant frequency of your antenna, that is 
an indication that your ground radials are insufficient.  The resonant 
frequency of a vertical or inv L will change as a function of your 
radials, if you only have a few radials.  As you add more radials, the 
resonant frequency will stabilize and no longer move. Your feedline is 
acting as a long radial.

Jerry, K4SAV