At 7:23 AM -0600 10/7/02, n4kg@juno.com wrote:
>On the Low Bands, verticals are often better than (low) dipoles
>for DX where a 1/2 WL high 80M dipole needs to be 140 ft up!
Let's compare a vertical with a horizontal dipole at the same max.
height of, say, 70 ft.
NEC-4 says, for
* f = 3.5 MHz;
* vertical dipole top height = 70 ft (21.336 m) and bottom height = 2 m;
* my New England ground (see my previous post); and
* elevation angle = 7.5 degrees
Antenna | Gain (dBi)
-------------+-----------
|
Vertical | -7.4
|
Horiz. dipole| -5.6 <-- better than the vertical by 1.8 dB.
at 70 ft. |
(broadside) |
73 de Chuck, W1HIS
|