Loading coils do NOT shorten an antenna! They electrically lengthen an
antenna that is already physically too short.

What do you really want to accomplish?

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.