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Phasing Cables Calculations



I am stcking four 2m yagi's in "H" pattern. I am trying to calculate the 
lenght of the four cables to the 4-way power divider.

I think it goes like:
11802.8/freq.Mhz, then divide by two for half wavelength, then multiply by 
velocity factor of cable (for Andrews FSJ4-50B = .81).

Using 144.140mhz, I come up with 33.163 inches of 1/2" heliax per 1/2 
wavelength.

Then I multiply by 3 for convenient cable length, 99.49 inches.

Is this the correct way to calculate the cable lengths?

All help appreciated.
73 John WB9PNU 
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