Why do you need to shorten a dipole for 433 MHz? A half-wave dipole is
a bit over a foot in length...

Scott
N0EDV

wrote:

Hi All,

At 433 MHz UHF, I need to reduce the lenght of the dipole using loading
coils or a better method.

I need to know if there is a antenna program or a method to determine
values and location.

tnx de KJ4UO.