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Question: Toshiba DVR620 won't hookup

I need to know if I can use this unit if I only have a coaxial cable coming into my house to my TV. (No box) I read online something about an RF Modulator. This is all greek to me. I'm from the old days of hooking up vcr's. Please help me I am an older woman at my wits end. All I want to do is record my shows I miss, and copy my vhs to dvd.