( ( Capital ( Radio 604 ) ) ( actually ( ( ( ( ( operated ( on ( ( ( 603 kHz ) , ) ( Medium Wave ) ) ) ) , ) but ) ( promoted ( ( a frequency ) ( ( to which ) ( ( the jingles ) ( would rhyme ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNP Capital) (NNP Radio) (NNP 604)) (ADVP (RB actually)) (VP (VP (VBD operated) (PP (IN on) (NP (NP (JJ 603) (NN kHz)) (, ,) (NP (NNP Medium) (NNP Wave))))) (, ,) (CC but) (VP (VBD promoted) (NP (NP (DT a) (NN frequency)) (SBAR (WHPP (TO to) (WHNP (WDT which))) (S (NP (DT the) (NNS jingles)) (VP (MD would) (VP (VB rhyme)))))))) (. .)))
Capital Radio 604 actually operated on 603 kHz, Medium Wave, but promoted a frequency to which the jingles would rhyme.
(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))) (. .)))