Bottom: Original 1.2G antenna - unshield portion 5.8cmTop: DIY antenna 
The exact length of unshield portion is made by telescoping the shileding layer.
The exact length of unshield portion is made by telescoping the shileding layer.
Shielding is reinforced with foils.
Now it weights only 5.1g, the original antenna is over 25g !frequency wavelength calculator
http://www.csgnetwork.com/freqwavelengthcalc.html
Ch 7 1.20G ~ 1/4 lambda 6.25cm , half 12.5cm
Ch 9 1.28G ~ 1/4 lambda 5.85cm, half 11.7cm
http://www.emtalk.com/mpacalc.php?er=1&h=10&h_units_list=hmm&fr=1.2&Operation=Analyze&La=104.644833544&L_units_list=Lmm&Wa=125&W_units_list=Wmm&Rin=90.0000000007
Having dielectric height 10mm, the upper patch will be of size 103x117mm
Also rc-cam site has a ready made size http://www.rc-cam.com/gp_patch.htm
Other nice website about the Rx/ Tx http://www.minikits.com.au/tech.html
http://www.csgnetwork.com/freqwavelengthcalc.html
Ch 7 1.20G ~ 1/4 lambda 6.25cm , half 12.5cm
Ch 9 1.28G ~ 1/4 lambda 5.85cm, half 11.7cm
http://www.emtalk.com/mpacalc.php?er=1&h=10&h_units_list=hmm&fr=1.2&Operation=Analyze&La=104.644833544&L_units_list=Lmm&Wa=125&W_units_list=Wmm&Rin=90.0000000007
Having dielectric height 10mm, the upper patch will be of size 103x117mm
Also rc-cam site has a ready made size http://www.rc-cam.com/gp_patch.htm
Other nice website about the Rx/ Tx http://www.minikits.com.au/tech.html
I did my receiver patch antenna as well, the ground test range is near 2x the original antenna.
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