Sloper Questions
 

Hello:

Have the following questions regarding the typical Sloper antenna to be used
from
30 MHz on down to the broadcast bands. Listening only.

Would be mounted outside (high end at the house)

a. Is the most sensitive direction along the axis, or perpendicular to ?

b. If along the wire axis is most sensitive, Is there a meaningful
difference in sensitivity for signals originating in the direction of the
low end (low point being closest to signal origination, is probably the best
way I have of delineating the direction)), or vice-versa ?

Is the answer freq. dependent ?

Thanks,
Bob

Sloper Questions
 

For practical receiving purposes, a sloping wire, in the midst of
buildings, can be considered to be omi-directional, even isotropic.
Any variations in directivity, in either the vertical or horizontal
planes, although they exist, are not measurable or noticeable. The
random effect of the presence of a nearby building or buildings is
greater than the direction in which the wire may or may not slope.

Sensitivity is frequency dependent. It falls of rapidly when the
length of the antenna is less than 1/6th wavelength at the lowest
frequency of interest.

Of at least as great importance is the grounding system. With ordinary
garden soil you will need at least 5 or 6 shallow buried wires under
the antenna, radiating from a common point in random directions.
Ground wire length need be no longer than 1/12th wavelengths at the
lowest frequency of interest. Lengths and numbers are very
non-critical.

A sloping wire or inverted-L is the best general-purpose antenna you
can get. Just erect something, not forgetting the ground.
----
Reg, G4FGQ.