W1TR 4.6 MHz (USAF MARS) Halfwave Sloper

Updated 19-Jun-2006  22:34

 

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The 4.6 Mhz Halfwave Sloper (dipole) is constructed from #10 stranded insulated wire available in most hardware stores.

The feedpoint uses a T-section of PVC pipe.  The coax loops through the PVC pipe to provide strain relief.  Wires are tied using a square knot to the PVC pipe and also to rope which is then tied to tree trunks after going over the tops of trees.  The antenna slopes to the south to give good directivity towards most of USAF MARS Region One.  The “springiness” of the small branches appears to help the wire antennas survive 60 knot winds with little or no damage.

 

This antenna also works well on the 20 Meter amateur band on the 3rd harmonic frequency.

 

 

Feedpoint of 4.6 Mhz Halfwave Sloper

(look in the center of the picture which is the coax and upper leg of the dipole, not at the diagonal wire near the top which is the 160 meter dipole)

 

Rope Support for the lower leg of the dipole ( I really need to get some black Dacron stealth rope !!)