So I after a long winter I took my 560SEL out for a drive today. Since the car sat covered for 3.5 months (yes, I started it regularly) the antenna only goes up about 1 foot and stops. I've tried pulling on it while its coming up but it doesnt help. Any suggestions?

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1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500