R: [TowerTalk] Performance of the C4/E on Warc and 40 M?

[Maurizio Panicara]

It depends only by  the roof extension if some (lower) wave angle is
determinated by the antenna height over it.
Having a roof whose lenght is enough (several wavelenghts) to influence
elevation angles, if it's a metal one or not doesn't change much when
polarization is horizontal.
At least on HF, in most of the cases the roof is small enough not to
determine anything on low and mid elevation patterns.
If the antenna is kept high enough from roof not to suffer losses due to
coulpling and elements detuning by excessive proximity (higher Q antennas
are more critical), the height above ground (or better to say the height
over other buildings at strategical distances) is the only parameter that
determines actual patterns on the vertical plane.

73,
Mauri I4JMY


----- Original Message -----
From: Al Williams <alwilliams@olywa.net>
To: <kd4rwn@bellsouth.net>; <towertalk@contesting.com>
Sent: Monday, August 07, 2000 10:06 PM
Subject: Re: [TowerTalk] Performance of the C4/E on Warc and 40 M?


>
> For beams mounted on buildings, especially commercial building that may
have
> metal in roof (even all metal roof), is the height for wave angle purposes
> the height above ground or above the building?
>
> k7puc
>



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