W1TR 3.3 MHz (USAF MARS) Halfwave Sloper

Updated 04-Jun-2011  21:26

 

[back to W1TR Antennas and QTH]

[back to W1TR Home]

 

The 2.6 Mhz “M” 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 faces East / West 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.  The center of the antenna is rather low and the legs go over two trees in a row of trees used by several MARS antennas.  This makes the horizontal dimensions of this large antenna fit in a smaller space.

 

Antenna 2.6 Mhz M Dipole.gif