> >I wrote a spreadsheet (xls version 4) for the helix antenna formulas from
> >website: www.mindspring.com/~nzkiwi/helix.html. The half power beam width
> >doesn't make sense. It gives 0.15 degrees for the HPBW, both on the
> >and on my spreadsheet. Does anyone have the correct formula?
> Is it possible your spreadsheet is computing the beamwidth in *radian
Yes, but when I change it to degrees, I still get about 1 degree or something
too low. My formula must be faulty.