[Antennas] Help With Antenna Decision,

[David J. Ring, Jr.]

The best antenna for this location would be a dipole that overlooked the 
slope:

The double line represents a bamboo pole - suspend a inverted vee dipole 
from that.

If the dipole is 6 to 15 feet away from the "cliff" where it slopes away, 
the cliff not only will act as a ground reflector, but the fresnel 
reflections of the antenna will combine in a way to reinforce the lowest 
angles of radiation towards the horizon.  This is a DX killer antenna which 
will compete with a kW station with a 3 element monoband beam and will often 
be stronger!

                     //   < suspend rope here
                   //     \
                 //           \
              //                 \
_Hill__  //_                    \
              )                       \ <= center of inverted Vee dipole 
attached to rope here.
               )
                )
                 )
                  )
                  )
                  )
                  )
                  )
                  )
                  )
                  )

Hope this helps!

73

David N1EA
----- Original Message ----- 
From: "Joe" <nss at mwt.net>
To: "Antennas!" <antennas at mailman.qth.net>
Sent: Thursday, September 28, 2006 7:04 PM
Subject: [Antennas] Help With Antenna Decision,


Hi All,

I have an opportunity to play with an un usual location for an antenna
experiment.  but have been thinking hard as to what type of antenna to try.

The location is a cliff,  yes a cliff that is 170 feet high.,, actually
it is a sharp ridge  that for every direction except the access path is
has like a 45 deg slope.
  hmmm Ok  the 170 foot tall cliff face is running east west.  and the
spot we can operate is out at a nose point so that say from 90 deg
through 180 and to about 200 az  is a drop-off of about 45 degree
slope,,  just to the south west is the only ground and the access to
this spot.

if you were to operate say like field day from there or just to play
around,, what kind of antenna would you put up?

Joe WB9SBD
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