[TowerTalk] How do ferrite cores affect the length of a phasing line?

[David J Rodman MD]

Hi, I need to troubleshoot my 4Square.  One of my dipoles probably has a 
bad feed point.  I decided to replace the 4 W2DU current baluns with 
direct feed points and #43 material ferrite cores on the feed line.  
According to my calculations, I would need about another 1' of RG59 
transmission line to correct for the loss of the balun.  The question is 
does the 1 foot extra include the length of coax under the cores or does 
it exclude it???? 
Thanks.