Quote:
Is there a wavelength formula...

The basic formula to convert frequency into wave length is 299.8 Meters/Frequency (MHz)
For example, UHF channel 14 is 470 MHz to 476 MHz. Therefor, if you want to know the wave length at that channels center frequency (473 Mhz) you would divide 299.8 by 473, the result being 0.634 Meters (rounded to three decimal places).