An alternative to the 6M7JHV antenna for 6m / 50MHz
This is the wire data as used by Justin, G0KSC in his EZNEC Pro/4 modelling.
These are the plots supplied by Justin, G0KSC from his EZNEC Pro/4 design tool. Notice the nearly complete absence of the two 45 degree front facing lobes.
This is about as good as it comes.
Performance variation across the bandwidth
With the LFA design, the f/b and gain are relatively flat across the complete the required 50 to 50.4MHz bandwidth of 50 to 50.4MHz.
Whereas, the 6M7JHV f/b (red) drops away from 25 to 20dB over a similar frequency range.
(1) As modelled by G0KSC in EZNEC Pro/4