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Old 09-14-2013, 08:09 AM
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The length of the antenna on a typical 2.4GHz receiver is 28.8 to 32 mm long, most are about 28.8 mm. The antenna is that length of bare line often at the end of a longer coaxial cable to move the antenna farther out from the receiver. Yes, the length of this is somewhat critical and can greatly vary the distance that the signal can be reliably received. To long can be just as bad as to short unless you can accurately make sure it is some odd multiple of an electrical quarter wavelength; i.e. 3/4, 5/4, 7/4 etc. Note that electrical wavelength can be different than a simple measurement as it depends on the velocity factor of any coax or other line involved.