"Think of it this way -- the other half of the antenna (the
radial system) is very broadband, so only the top half (the
radiator) contributes to narrowing the bandwidth. "
Unfortunately if one models a free space dipole with zero loss and resonant at
1.8 MHz, it's 2:1 swr bandwidth is 98 kHz. If one models a zero loss quarter
wave over perfect ground resonant at 1.8 MHz it's 2:1 bandwidth is also 98
kHz. (NEC4)
I've noted something like what w8JI reports though I couldn't have placed it
at 2:1. There is something at work. I would suspect it has something to do
with ground lossiness with vertical polarization, but I don't have a shred of
a fact to back it up.
73, Guy.
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