My experience (admittedly really limited to 160m) is
that it is pretty easy to get ~50% efficiency. It is
pretty hard to get close to 100%.
My justification for saying this is that at one point
I had an inverted L (in a tree) with about a 50'
vertical section fed against a few poor radials. I
also had a 95' top loaded vertical fed against >150
long radials about 400' feet from the inverted L. The
difference between the two was certainly well less
than 6dB. I also had a 300' vertical at my remote site
(about 7 miles away) fed against 120 x 1000' radials.
No great difference between that and the 95' vertical,
although the DX characteristics were a bit different.
Quite depressing really!
73 Roger
VE3ZI
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