BRARC-80th

160 m Dipole - Old and New

Here is a series of plots that compare the radiation patterns of two versions of multi-band dipole antennas at KB0BH:

• Old dipole: 240 ft end-to-end, 35 ft high, 450-ohm balanced line feed
• New dipole: 230 ft end-to-end, 60 ft high, 450-ohm balanced line feed

Modeling for the old dipole includes the fact that 20 ft on each end hangs down vertically.
The graphics below include horizontally polarized pattern in the horizontal plane and vertically polarized pattern in the vertical plane. Three frequencies were analyzed (1.9, 3.7, 7.2 MHz). The frequencies are identified near the upper left corner of each plot.

In all cases the antenna structure is oriented from left to right on the plots. 

Each plot shows the patterns for both antenna cases, for comparison. The color legend is shown at the lower left corner of each plot. Numerical markers for maximum gain and beam width are for the new dipole. Click on any image for a full size view.

The software can provide additional types of radiation patterns.