I agree with Duke. Winter salt can take a toll on power antennas. I have sucessfully freed-up a couple stuck antenna sections using two pairs of pliers (one on each section and twist). Do this only as a last resort because it is easy to crush and ruin the mast if you use too much force. I use a couple wraps of electrical tape so the pliers don't scratch the finish. Once you get it unstuck, work it by hand, then clean and lubricate it.