[aprssig] What a diffeence an antenna makes

Jason Winningham jdw at eng.uah.edu
Mon Oct 31 11:49:30 CST 2005

On Oct 31, 2005, at 11:43 AM, Stephen H. Smith wrote:

> A half-wave's maximum radiation lobe is straight out toward the 
> horizon (perpendicular to the wire) while a quarter wave's maximum 
> lobe is about 15-20 degrees above the horizon,  actually making it 
> better for things that are in the air rather than on the ground.

what does the J-pole radiation pattern look like?

We've been flying roll-up J-poles on balloons recently.  They've 
performed well, but there is a noticeable null directly under the 


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