[BC] Rooftop arrays

[Milton R. Holladay Jr.]

It appeared to have regular radials laid out on the roof (it was dark, so I
didn't see it too well)
M
----- Original Message ----- 
From: "Richard Fry" <rfry at adams.net>
To: "Broadcast List" <broadcast at radiolists.net>
Sent: Sunday, November 27, 2005 9:42 AM
Subject: [BC] Rooftop arrays


> Milton R. Holladay Jr.:
> > WMFR-We Make Furniture Right-was, last I knew, a self supporting
> > tower atop a 9(?) storey building in High Point, NC......(I measured
> > the impedance once)
> Phil Alexander:
> To ground? Or to the ground strap? <g>
> ___________________
>
> If there is room to run even two 1/4-wave, h-plane radials off from the
> elevation of the tower base, this system could have acceptable base Z,
> efficiency and patterns.   The antenna works against the radials, and
> doesn't need "earth ground."
>
> This is a form of the ground plane antenna developed by George Brown of
> RCA -- who reported that two elevated radials were about as good as a lot
> more.
>
> It's even possible to use loading coils in/with radials shorter than
> 1/4-wave, with some loss of efficiency (but still not too bad).
>
> RF