For design of short, vertical, antennas, with helical loading coils of
many turns, download program

HELICAL3

from website below.

Such antennas are suitable for mobile operation on the 160 and 80
meter bands. At higher frequencies an ordinary short loading coil
suffices.

Input/output data - height of helix, diameter of helix, number of
turns, length and diameter of loading rod or whip. Radiating
efficiency, etc.
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Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
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