( It ( ( is ( divided ( into ( 11 ( radio-wave ( propagation ( frequency ranges ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (VP (VBN divided) (PP (IN into) (NP (CD 11) (JJ radio-wave) (JJ propagation) (NN frequency) (NNS ranges))))) (. .)))
It is divided into 11 radio-wave propagation frequency ranges.
(ROOT (S (NP (NNP Am) (NN radio) (NNS waves)) (VP (VBP exist) (PRT (RP in)) (NP (DT the) (ADJP (QP (CD 540) (TO to) (CD 1600))) (NN khz) (NN frequency) (NN range))) (. .)))