I agree with Torsten. You need make no changes to your present run of
cables (along a messenger cable) other than adding clamp-on chokes to each
wire (including the messenger cable). If the "run" is a significant part of
0.25 WL at a frequency of concern, you may find it desirable to place a
second set of clamp-on-chokes about 0.25 WL from the first set or near the
house entrance (whichever comes first).

You will need radials in order to have reasonable efficiency. An
impedance bridge will help in finding the connection spot on the tower where
the real part of Z is 50 (or 70) ohms.

Let us know what you do.
73 Mac N8TT

--
J. Mc Laughlin; Michigan U.S.A.
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snip

Shunt feeding the tower is probably the simplest option.
Why not coil the feedlines into chokes when they leave the tower, or
put stacks of ferrite beads on them to keep RF off them?

Torsten
N4OGW