  We present measurements of R_Kl3rad = Gamma(KL->\pi\ell\nu\gamma; Egcm > 10
MeV)/Gamma(KL->\pi\ell\nu), where ell = mu or e, and Egcm is the photon energy
in the kaon rest frame. These measurements are based on KL decays collected in
1997 by the KTeV (E832) experiment at Fermilab. With samples of 1385
KL->\pi\mu\nu\gamma and 14221 KL->\pi\e\nu\gamma candidates, we find R_Km3rad =
(0.530 +- 0.019)% and R_Ke3rad = (4.942 +- 0.062)%. We also examine
distributions of photon energy and lepton-photon angle.
