Radio Question

I have a 1990 420SEL that's having intermittant radio problems. After I start the car, I hear a rythmic (SP) clicking from the speakers.
Eventually, the clicking stops, the antenna extends and the radio plays fine, or sometimes the antenna extends, the display is blank, but I can hear background noise.
The radio is original equipment. Two questions: First, does the radio consist of a dash unit and a remote unit, or is it all contained in the dash unit? If remote, where is it located? And, does anyone have any ideas on what's wrong with it? I MISS MY RADIO!!!
TIA for any help.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.