**@gregy:**

The simulation results for "Varying the Length of Elements" for CoCos made of:

RG6 FPE 0.83 VF;

RG58 PE 0.66 VF;

Air insulated tube;

show that the minimum SWR occurs 5 to 10 millimeters away from the length obtained by standard formula "Length = 1/2 wavelength x VF".

Please see many tables of simulations of different CoCos I have posted yesterday.

This may be due to:

EITHER

the standard formula is not precise but a close approximation only.

OR

the simulation software is not accurate & gives approximate results.

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