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
See posting on Spiderbeam group at groups.io:
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
Of course 200ft is not far away.
Will try the same with my Mid Tri when it is installed.
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