Be honest with the interviewer. If you have experience, simply say, "Yes, I do!" Follow this up by telling the interviewer how often you use the radio.

If you do not have experience, do not worry! Tell the interviewer that you do not have any experience, but you are willing to learn. If you regularly use a computer, tell the interviewer, and say that you feel a computer is probably more complex than a radio device which makes you feel like you can easily learn.