VK4FWH's Improperly Scaled Rhombic
Free Space
14.2 MHz
4 wires, meters
25    0      0 0   96 -46.75 0  #12
25    0      0 0   96  46.75 0  #12
25   96 -46.75 0  192     -1 0  #12
25   96  46.75 0  192      1 0  #12
1 source
25,1000,0
0 loads

This is what happens when you take a proven rhombic design and simply scale it
up, in an attempt to get more gain.  The shape of these antennas must change as
they get bigger, or you get the severe lobe splitting that this antenna
exhibits.