An alternative to the 6M7JHV antenna for 6m / 50MHz
Checking the front to back ratio
This is GB3RAL on 50.050MHz sitting at around s8 at G3WOS's QTH. The stack is pointing straight at them 310 degrees.
Full on GB3RAL
I then turned the stack a full 180 degrees to 130 degrees and the beacon disappears into the noise. You can see that this direction is much noisier but a front to back ratio of at least 30dB can be seen - exactly as predicted in the design.
180 degrees from GB3RAL