# Does the Cosmic microwave background also lies in radio frequency spectrum?

I heard the CMB is the electromagnetic radiation from the big bang. It is 13.7 b years old but isnt it only in the microwave range of the spectrum (300MHz - 300GHz) . Can a FM radio receiver (87-108MHz)pickup the noise from the CMB ?

I don't think it has neat boundaries...

The CMB has a blackbody spectrum at T = 2.7 K, which peaks in the microwave range ($\lambda \approx 2\,{\rm mm}$). The intensity of the blackbody spectrum is given by Planck's Law: $$B(\nu,T) \propto \frac{\nu^3}{e^{h\nu/kT} -1},$$ which decays but is nonzero at lower frequencies.