( ( ( A ( radio wave ) ) ( of ( any frequency ) ) ) ( ( can ( have ( different ( signal types ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN radio) (NN wave)) (PP (IN of) (NP (DT any) (NN frequency)))) (VP (MD can) (VP (VB have) (NP (JJ different) (NN signal) (NNS types)))) (. .)))
A radio wave of any frequency can have different signal types.
(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))) (. .)))