Originally Posted by stereocraig
The directors on my 91XG and 7698P have equally spaced directors.I will not be using these for the project though.
The parts antennas I would be using, have directors that gradually change spacing, similar to a fretted instrument.They are those Stellar Labs antennas that have the three separate booms that flare upward and downward and straight forward. I thought I'd remove the upper and lower boom and add those to the front of the main one, but the spacing would be inconsistent.
I was going to do this based on information here
using this calculator
. Before putting in that much effort, I simply removed one director from a couple front halves and joined two fronts to a complete Stellar Labs 30-2476
. This worked well and I abandoned plans to drill.
I suggest you go with a little trial and error before designing from scratch.