If you're fussy, the correct antenna length depends upon the frequency.
Wavelength = Speed of Light / frequency In meters = 299, 792.458 / frequency in MHz In inches = 11,802,852.6771654 / frequency in MHz
Quarter Wave = Wavelength / 4 R/C receiver antenna are typically quarter wave, so compute the wave length using a formula above and then divide by 4.
For example 72.000 MHz frequency band generically, ignoring decimal 1/4 Wave = 1.0409 meter (1040.9 mm) 1/4 Wave = 40.982 inch
72.270 MHz frequency, specifically 1/4 Wave = 1.0370 meter (1037.0 mm) 1/4 Wave = 40.829 inch
All of the rx I saw, 72MHz, 53/50MHz, 27MHz, all have about 39 inches(1meter) of wire coming out of the box. So either they are tuned inside with some magic circuit or what?
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