Yes, you can calculate the wavelength of a dipole. You may use the formula:
Wavelength = c /( f × 1000000)
where:
c - The speed of light equal to 299,792,458 m/s; and
f - The frequency of the antenna.
All you have to do is divide the speed of light by the product of frequency and 1000000. And as a result, you have the wavelength of the dipole antenna.
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