michel wrote:
In a simple way... I have a vertical radiator of 2 x 5/8 wave length. That
is serie with 450 ladder line one side connected to the radiated element and
the other to a groundplane will work?

I cannot tell from your description what is your
exact configuration. Is this it? (fixed font)

GndPlane--+ +-------------------------------------
| | 1.25WL vertical monopole
| |
| |
| | 450 ohm ladder-line
| | to transmitter

Simple vertical monopoles should not be longer than
5/8WL.
--
73, Cecil http://www.w5dxp.com