[Antennas] Antenna length measurements

[Buck (N4PGW)]

Now to embarrass myself.

In the good-ole-days, the ARRL handbook had a formula for measuring the
length of a 1/2 wave dipole that included the diameter of the wire or
element.  Where we normally use 468/freq in MHz - feet, there was a formula
where the diameter of the element was calculated in to get a more precise
answer.

Does anyone remember what that formula is or where it may be found?  I
loaned my 04 handbook to my kids so I don't have it.

Thanks

Buck