Boy, It reminds me the Island of Sein, one of most west located
Brittany-island of France near Brest which has still its light-house
and two masts rusting waiting for Hams and IOTAs contests
operations...
Now back to your questions:
Your 2 masts are probably over 80M high, e.g. a bit over halfwave
high for 160M if they are quaterwave high on 870 kHz... whatever,
but great low angle take off radiation!
On top-bands, a shunt (unipole) feed at half mast or lower or higher
even from top should do it . Run a wire from midheight tap or even
top of tower sloping directly to your
hardwire-300ft // feed-line . One // wire to slope, other to common
radials groundpoint.
Use al coupler at your shack to match your TX to your said // hard
feed line.
Should amaze!
Pierre.
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