[Repeater-Builder] DB212-3

[NORM KNAPP]

Took down a set of DB212-3 dipoles in good shape with harness. I want to use 
them on 6m for a repeater antenna. I also want to add one additional dipole. I 
guess I will need to modify the harness and the dipoles as they are marked for 
35.960 mhz....
I will be mounting all four (or 3) on one leg of a tower that is 4 feet on a 
face. Is it worth my while to go for the 4th dippole? The loops are 155 inches 
from tip to tip now. Looks like they need to be about 105 inches.
Anyone with any tips, pointers or advise?
Thanks....