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Radio-frequency magnetic and dissipative properties of La0.6Sr0.2Mn1.2O3 and La0.65Sr0.28Mn1.07O3 ceramics have been studied in the region of their Curie points. It is established that, despite relatively high conductivity in the frequency range f = 1–15 MHz, the screening of samples by the skin current is negligibly small and the ceramic samples behave like strong ferromagnets. This behavior is explained by significant differences in the propagation of electromagnetic field in inhomogeneous granular ferromagnetic media and normal metals. The field dependence of the effective magnetic susceptibility of both manganites has been studied at room temperature. © 2004 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]