W4OG

Antennas

A NOTE OF CAUTION.  I NEVER RUN POWER WHEN USING THESE

ANTENNAS.  YOU WILL BE SURPRISED ON THE NUMBER OF QSO'S

YOU CAN MAKE USING ONLY 100 WATTS.



Photo's from: 

 

Top Left

 

Tarheel Antennas Model 100A-HP  

 

Notice the radial plate at the base.  There are 2 radials cut for 80 thru 10.  I also used about 15 radials at random length for a total of 25 radials.  A screwdriver controller at the operating position is used to find resonance.  A raised ground plane does not need as many radials to be efficient.  For more information about vertical antennas and radial systems go to the links page.

 

Top Right

 

Halo Antenna for 6 meters 

 

It is constructed from 1/4 inch aluminum fuel line.  This antenna uses a gamma match, also constructed from 1/4 inch fuel line.  Designs for this type of antenna can be found online.

 

Bottom Left

 

Twin Halo's for 2 meters

 

It is constructed from 1/4 inch aluminum fuel line.  Using the same gamma match design as the 6 meter halo.  I decided to stack 2 halo's to perhaps get a little more gain.  Construction details can be found online.  It works fine when reaching the local repeaters.

 

Bottom Right

 

Off Center Fed Dipole (OCFD)

 

The total length is cut for 40 meters about 65 feet.  The feed point is about 15 feet from one end.  A 4:1 current balun is needed for the antenna.  Since it is 65 feet long one end bends around in my attic.  The pattern is broadside to the antenna just like a dipole.  Sometimes this antenna works better than the vertical. 



Antenna Update 15Mar2014

Well I decided to put the Gutter antenna out of service.  I'm now using a 119ft End Fed Inverted "L"arrangement.  The vertical portion of the wire goes up about 25 feet.  I fabricated a few standoff's using eye hooks and wood dowels to secure the wire along the same corner of the house where the downspout is.  The wire then angles up to a tree about 60 feet high. Using the MFJ998RT remote tuner I still get a match of 2:1 or less from 160m to 10m.  The same ground radial system is still being used for the 119ft wire.  I just substituted the 119ft wire for the gutter/downspout.  The signals seem to be a little stronger with this new arrangement.  As far as stealth goes, the wire is difficult to see.  There is a lot of information on the WEB regarding END FED - Inverted "L" antennas.  You just need to pick the correct length for the amount of space you have available. 

Hamuniverse.com
  (click on the link) has some excellent information on end fed antennas. Good luck if you decide to put up and end fed wire antenna.



W4OG - EM83bw - Dacula, GA 30019
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