I am getting JK Mid Tri 40 next month so this discussion is interesting.
Regarding F/B, one question is how to measure it across the band to see
whether reality reflect simulation.
I erected Spiderbeam at 45 ft as a temporary beam.and used a wideband noise
generator connected to a dipole some 200 ft away, with response measured on
Flex 6600.
See posting on Spiderbeam group at groups.io:
https://groups.io/g/SPIDERBEAM/topic/my_new_hd_spiderbeam_and/67470919?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,67470919
The Spiderbeam had very narrow F/B characteristics on 20m, with peak > 30db
but just 10db 120 KHz away. This is despite being 3 el. I think the
numbers are a few db below simulations in fee space. However the gain seems
flat.
Of course 200ft is not far away.
Will try the same with my Mid Tri when it is installed.
Ignacy, NO9E
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