I commented off-reflector...but this is getting interesting,
so forgive me for wading in, if this is obvious to you:
1) Make an inverted Ell using the tower. You can't decouple
it..it'll have stray currents anyway...so you might as well
control it.
2) Put in the best ground system you can muster around the
tower. It'll serve you well.
3) Concentrate on receiving antennas. They're every bit as
important.
4) As an alternate to #1, consider a top-fed L, per Cebik's
article. It's a bit hard to organize, but looks promising.
All that current is as high as you can get it....earth losses
are minimized, within your boundaries.
5) As an alternate to #1 and #4, try a YCCC U dipole. It's a
vertical section as high as you can manage...with balanced
horizontal sections up high, and down low, to make up a
bent dipole. This works. And it can be made 2 band, using
twinlead. Most radiation is low angle from the vertical
section. The horizontal section fields cancel. Sort of,
more or less.
6) revisit #3....somebody suggested an on-ground beverage.
If your ground is actually 30' below the earth's surface,
or 20, or 10, this might be a good solution. Worth trying.
Otherwise, it's EWES for youse!
73/n2ea
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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