[DX] dipole vs horiz. loop for low band DXing

Mon, 4 Nov 2002 08:29:32 -0600

ANY horizontally polarized antenna at 1/4 Wavelength (WL)
or less in height will radiate primarily straight UP.
If you cannot place a horizontally polarized antenna
for 40M at least 50 ft high, you would be better off
with a GOOD VERTICAL antenna which also requires
at least 30 radials, preferably 1/4 WL long.
See any good Antenna Book such as the ARRL
Antenna Handbook for ground reflection coefficents
vs height and plots of horizontally polarized antenna
patterns in the vertical plane.
I like the MFJ 1792 80 / 40 vertical which is full size
on 40M with a TOP isolating / loading coil and top hat
for 80M. It is reasonably priced around 160ドル.
BASE Loaded verticals (HF2V, HF6V) etc
have the LEAST efficient loading for 80M.
Tom N4KG (RF Engineer, DXer, Contester)
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