Depends on whether it is a dipole or some other configuration -- but for
dipoles -- see calculator at URL:
http://www.qsl.net/w4sat/calc.htm

Others at URL:
http://www.qsl.net/w4sat/antenna.htm

--
73 Cambio
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"FAZAMY" wrote in message
...
What is the physical length of the radiating element(s) of an fm band
antenna
broadcasting on 88.1 and 107.9?

What is the formula to figure this out?

KB2AMY