Topband: electrically shortening a tall grounded tower

[Herbert Schoenbohm]

Bob Kupps wrote:
> Hi
> Is there any effective way to electrically shorten a tall grounded tower to 1/4 wave? I tried modeling a 1/4 wave cage surrounding the tower but it still shows a lot of current in the protruding section with resulting high angle radiation. Then I tried modeling a 1/4 wave stub above the cage grounded at the top to the central tower which appeared to turn it into a dipole and still significant current above the stub. I was also thinking of using an external parallel resonant trap/choke but would this actually work when situated at a zero current point at the far end of a 1/4 wave monopole?
> Thanks and 73 Bob N6BK/HS0ZIA
>
>
> Bob,

You might consider feeding it with a shunt fed cage at about 1/4 down 
from the top and attach elevated 1/4 wave radials at that point.  I had 
a 308 foot tower and took the easy way out by running up a halyard and 
hanging slopers or a delta loop.

Cheers,

Herb, KV4FZA
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