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I have a vague recollection using this method. I think I could test the VF of a piece of coax, and maybe even test my tuned 1/2 wave jumper to see if it was spot-on the frequency I wanted. 


Not sure how successful I was at clipping the coax length in the process of tying to construct a tuned 1/2 wave or multiples however.


I also seem to remember this idea was not always as easy as the words made it seem.


Here is an old video on a similar idea 


[MEDIA=youtube]S5_LC-LKTDQ[/MEDIA]