K9RZZ,
..
AHaaaaa )
We have a difference of 'opinion' and a matter of perspectives ;-)
..
I would agree with you that it could be called a "Bent" Random
Wire Antenna: If the Lay of the Wire Antenna Element was in the
Horizontal Plane [Flat].
- Across-and-Out View
- - Top-Down Perspective
- - - Only Horizontal Polarized
..
However, in this instance the Lay of the Wire Antenna Element
is both in the Horizontal Plane and the Vertical Plane.
- Bottom-Up View
- - Side Perspective
- - - Both Horizontal and Vertical Polarized
..
Then Again - Going back to the 'original' 45 Foot Horizontal Wire
Antenna with a 22 Foot Vertical Ground Wire; that is fed with a
Matching Transformer. It could be 'viewed' as an Off-Center-Fed
Dipole with One Side Terminated.
..
NOW - If the 'original' 45 Foot Horizontal Wire Antenna with a
22 Foot Vertical Ground Wire is Modified with the addition of
a Vertical Down-Leg at the End of the Horizontal Wire; and still
is Fed with a Matching Transformer at the Top Near Corner.
It could be 'view' as directive array of Two Vertical Elements;
on the Far-End a Driven Vertical Element and on the Near-End
a Vertical Reflector Element.
..
for any piece of wire being used as an antenna . . .
- there are no rights or wrongs
- - its all a matter of perspective
- - - what works - works !

wrote:

So does this mean that an antenna that is configured as an Inverted L
but grounded and fed from the end of the horizontal unit will perform
significantly different, and is not in fact an "Inverted L"?

A properly installed inverted-L will have the balun near the ground at
the end of the vertical downlead wire. This allows for a short ground
wire from the balun to a grounding rod. The receiver is fed with coax
from the balun to the house.

The inverted L design seems designed to work for feeding a Rx at ground
level. I live on the third floor. Furthermore, it is often suggested
that the wire for most antennas should be away from the dwelling for
best performance. So back to my original questions, which are
essentially...

See my reply above. When you install it that way, you can run the coax
most anywhere to the receiver and still have a good RF ground to lower
the noise from domestic sources.

If I wish to install an inverted L from a third floor location, am I
better off a) with the vertical portion away from the building (at the
other end of the horizontal portion) or b) against the dwelling?

A low noise inverted-L will have the vertical downlead at the far end of
the horizontal section with the balun located at the lower end of the
single wire downlead, near the ground. Then you can run coax back to the
house from the balun. The near end of the horizontal section shouldn't
be too close to the house where it might pick up noise.

What kind of performance difference do these two options represent?

The 'low noise inverted-L' (paragraph above) can make a big difference
in lowering the noise that the antenna picks up from local sources.


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