Modeling the antenna

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  • by Eugene Mah
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Using the EZNEC ARRL version that comes in the ARRL Antenna book, I attempted to create a simple model of the antenna as it's currently set up.

Using a tape measure and some very rough estimating, I came up with this plot of how the antenna is set up, without the ladder line in the middle (haven't figured out how to add the feed line yet).

AntennaDiagram.png

AntennaDiagram_XY.png

The far field plots EZNEC gives me look like this

80m
AntennaFF_80m.png

40m
AntennaFF_40m.png

20m
AntennaFF_20m.png

10m
AntennaFF_10m.png

The antenna model is pretty simple and nowhere near perfect. I'm probably missing a lot by not having the feed line included. Based on these rough simulations though, it looks like I'm warming a lot of clouds (ham speak for when your antenna is sending radiation mostly straight up).