| > This antenna is a custom 'screwdriver'.
Radiation resistance formulas are at:
http://www.w8ji.com/radiation_resistance.htm
The coil loss can be pretty high on low bands in a screwdriver antenna, but
the ground loss is the real killer. It takes at least 20-30 radials about
2/10th WL long or longer to provide a decent ground if the radials aren't
way up in the air.
73 Tom
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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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