Joe,
Just put it up. It'll be fine.
I used an A-4S for 15 years in three different locations. The book
dimensions are fine. The resonant frequency will increase as the beam
goes higher. It'll be just fine.
Bill, N3RR
Joe Natale wrote:
>
> I just built the A4S/A744 Cushcraft 4 el tribander with 40m kit. I built it
> on a mast about 4' above the ground using the band center dimensions. The
> 1:1 SWR points are: 6.9, 14.050, 21.3 and 28.7. Do I tune it to resonance at
> it's present position 4' above ground or put it up on the tower as is and
> take my chances? It is going to be at the top of a 72' aluminum tower. The
> manual is very vague on these issues. This is my first beam and can use your
> advice. Thanks in advance.
>
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