Hi , unfortunately this is not an antenna issue.
his unit will need repair service by a local stereo shop.
The best thing to do is take it to Best Buy or a local Sears for this service.
They are excellent but usually take a week or so to have it back.
They are fair priced and do quality work also, they are honest!
This is typically an inexpensive fix;-)
I know it well but it requires special tools to replace the failed component which only costs a few dollars.
I wish I had better news for you I really do. But yes this one is definitely worth the cost of the repair ;-)
In any case, I will stick with you until this is complete.
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Thank you and have a great day!