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THE KL7JR 5 BAND PIPE VERTICAL
by John Reisenauer, Jr., KL7JR
A simple, cheap and easy to build 26 feet long vertical antenna
that works DX on 20 - 10 meters including WARC BANDS.
That's 20,
17, 15, 12 and 10 meters!
It is
designed for portability for field days, camping, or permanent
installation, cost, and to achieve at least 1/2 wavelength
on the
WARC bands.
You will not
believe it's performance until you try
it!
Material List:
1 ea 10 foot
3/4 inch EMT conduit
1 ea 10 foot
1/2 inch EMT conduit
1 ea 102 inch
CB whip
3 each hose
clamps
Assorted
bolts, nuts from junk box
Insulating
support for base of antenna (3 inch)
Assorted # 12
wire or plumbers tape for radial ring
4 to 6 or
more radials + - 16 feet long from wire for each
radial
NOTES and BUILDING TIPS: (See
drawing above)
Slide 1/2 inch EMT pipe into 3/4
inch EMT pipe 18 inches
Drill and bolt or pin above
sections together. (Assure that you have good electrical and mechanical
connections between all sections)
Hose clamp the CB whip on the
outside surface of the 1/2 inch EMT section assuring that it overlaps 12
inches with the 1/2 EMT for a total length of all 3 sections for a
total of 26 feet top to bottom.
Use some form of insulator on the
base to isolate the antenna from ground.
Build your ground and radial ring
from about a 12 inch diameter ring of wire and lay around the base of the
antenna.
Atttach the radials, as many as
you can lay out.
Attach the center conductor of
your coax to the base of the antenna and the shield to the ground ring
where radials are attached.
Raise antenna and support....you
may need to guy it with rope if windy.
