Here's some ASCII art to try to depict the set-up

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50' | | GTO15
Mast | | Wire Radiator
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| |____/---||------- AT140 tuner output pin
| ____Polyphaser
| | \---||------- AT140 ground/DC ground system
\ \ (single-pointed to prop shaft)
strap\ \ strap
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\ KEEL \
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\________________\