If your power radio antenna won't go up and down anymore, the problem is either a burned-out motor or the geared cable inside the mast. Both are easy DIY fixes. First, make sure the motor works.

To hook up the new cable, you'll have to remove the car radio. Fixed-mast antennas are much easier to replace. Buy a universal kit (about $15) from any auto parts store. To install the new mast ...