[NLRS] Antenna Height Question

[Clare Jarvis]

At 135 feet the antenna is essentially in free space.   At 35 feet it is
nearly in free space.   If you use a pre-amp near or at the antenna then I
would use the high mount.  Without a pre-amp then feed line loss
calculations should be performed.

Mr. Clare Jarvis
(507) 454 2575

PO Box 1264
Winona, MN 55987-7264


On Fri, Apr 2, 2021 at 11:24 AM Mike Cizek W0VTT <mgcizek at gmail.com> wrote:

> Greetings,
>
>
>
> Some newbie questions from an HF guy installing antennas for 2m and 222.
> Both are M2 5WL Yagis (thanks Vince!).   I have two options for installing
> these antennas:
>
> 1.      At 35' and 40' (more or less) on a short tower.  ~ 130' feed line
> length; LDF-5
> 2.      At 135' and 140' at the top of a long mast sticking out of a 125'
> tower. ~ 200' feed line length; LDF-5
>
> My first thought was that since this is VHF, higher is better. (period) I
> can easily put one on the short tower for testing, and plan to do that for
> the sprints this month.  I modeled the antennas at both heights, and was
> surprised at how similar the patterns are even with the 100' difference in
> height.  The main (lowest angle) lobes are only a few degrees of elevation
> and fractions of a dB apart.
>
>
>
> Other than greater line-of-sight coverage, is there any real advantage to
> mounting the antennas 100' higher?  My main goal is new grids for VUCC on
> both bands.
>
>
>
> Thank you.
>
>
>
> ----
>
> 73,
>
> Mike Cizek W0VTT
>
>
>
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