I am very pleased to show this antenna. It's arguably the lightest 2.4 ghz helical ever made. It's cnc cut out of 1.7mm vetronite (fiberglass pcb material without copper).
Its diameter was calculated for a center frequency of 2510, turn pitch angle is 13.43°.
The reflector is .4mm Fr4 with copper on both sides, and I installed a female sma in the back, soldering it well to the reflector. The antenna weighs only 34 grams. That's got to be the lightest helical antenna on 2.4 ever made.
This baby came out fine on the first try, I am amazed really. I just soldered the wave trap match where I thought it would go and put it on the Daiwa swr meter.
I had channel 5 lawmate selected (2370mhz), and it showed 1.5:1 ( I thought this could be good or bad), So I switched to channel 8 (2510mhz) and swr dropped to 1.2:1 , 2490mhz, is 1.25:1 and 2450 is 1.35:1 .
This means the SWR can still be lowered. I will lightly paint it all white and that should shift the frequency down by roughly 3% (that's what happens on my Pinwheels).
I think I can squeeze a 1.1:1 if I am lucky.
That's very good for a first cut prototype.