Topband: Using 4 - 6 elevated radials in lieu of 120 buried wires

[Brian D G3VGZ]

"Joe Subich, W4TV" <lists at subich.com> wrote:

> On 1/5/2024 12:53 AM, Robin wrote:
> 
> > One thing to bear in mind throughout any analysis of such designs for
> > 160M is that the total focus of the Broadcast designs and measurements
> > and proofs is energy at zero degrees elevation.  Our needs benefit from
> > low angle radiation, for certain,  but,  little attention is paid by the
> > broadcasters and by the modeling programs to position and shape of
> > elevated lobes, or for that matter, the shape of the main lobe above
> > zero elevation
> Not exactly true.  Many "modern" broadcast facilities are designed to
> minimize high angle lobes that cause destructive *self-interference* at
> the outer edges of the [night time] ground wave coverage.
> 
At an MF broadcast station  station I worked at 50+ years ago a qsy of
200KHz HF had been made. Severe fading was then encountered at the edge of
the service area at night from a high skylobe. About 200 feet was lopped off
the top of the 550' tower, which restored the fringe area reception.  

-- 
Brian D 
G3VGZ