1995 jeep GC stereo problems

my stereo in my jeep(262,00 miles) well the clock works some of the time (works for a few months then out for a few months )when clock is out stereo doesnt work when clock works stereo works but no reception ive checked the plug in and antenna all seem fine is my stereo dying or ??? do most new stereo's have match up plug ins? ..power ect