Should I charge them or go for free?

I am an upcoming artist with a lot of talen but not a lot of recognition. But there is this radio show in Chicago ( I live in Detroit) who wants to get me on their show because they really like my song. My ex manager is still promoting it because he looks at me as cash in his eyes but I didn’t want him to be my manager because he tries to change me and he’s older ( late 50s) so we don’t agree with the same things. Should I go to Chicago and charge these people for my time or not charge them because I need the publicity. They’re radio show is not really that popular and I can tell we both would be doing each other a favor. Also I heard that they’ve been playing my song almost everyday.
Should I charge them or go for free?
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